Diff of the two buildlogs:

--
--- b1/build.log	2025-03-16 12:07:08.529784496 +0000
+++ b2/build.log	2025-03-16 12:12:12.336069430 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Mar 15 23:58:06 -12 2025
-I: pbuilder-time-stamp: 1742126286
+I: Current time: Sun Apr 19 08:30:11 +14 2026
+I: pbuilder-time-stamp: 1776537011
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking rt-extension-customfieldsonupdate_1.03-3.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3326024/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-amd64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 Apr 18 18:30 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="37" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='87f6dfdbb2434cfba15133522ef241c3'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='3326024'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=79e5e832b7b24441ae21e01300c7c3c9
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=3968691
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.qfqPx76X/pbuilderrc_InUG --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.qfqPx76X/b1 --logfile b1/build.log rt-extension-customfieldsonupdate_1.03-3.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.qfqPx76X/pbuilderrc_rhSK --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.qfqPx76X/b2 --logfile b2/build.log rt-extension-customfieldsonupdate_1.03-3.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos1-amd64 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.12+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.12-1~bpo12+1 (2025-02-23) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3326024/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -519,7 +551,7 @@
 Get: 412 http://deb.debian.org/debian unstable/main amd64 libpod-markdown-perl all 3.400000-1 [33.2 kB]
 Get: 413 http://deb.debian.org/debian unstable/main amd64 libmodule-install-readmefrompod-perl all 0.30-4 [12.6 kB]
 Get: 414 http://deb.debian.org/debian unstable/main amd64 libmodule-install-rtx-perl all 0.43-1 [20.1 kB]
-Fetched 118 MB in 7s (17.3 MB/s)
+Fetched 118 MB in 2s (49.2 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libsystemd-shared:amd64.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19785 files and directories currently installed.)
@@ -1890,8 +1922,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Mar 16 12:03:19 UTC 2025.
-Universal Time is now:  Sun Mar 16 12:03:19 UTC 2025.
+Local time is now:      Sat Apr 18 18:33:44 UTC 2026.
+Universal Time is now:  Sat Apr 18 18:33:44 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up liberror-perl (0.17030-1) ...
@@ -2271,7 +2303,7 @@
 Done.
 Now inserting RT core system objects.
 Done.
-[3382015] [Sun Mar 16 12:04:59 2025] [warning]: Running with the internal HTML converter can result in performance issues with some HTML. Install one of the following utilities with your package manager to improve performance with an external tool: w3m, elinks, links, html2text, lynx (/usr/share/request-tracker5/lib/RT/Interface/Email.pm:1529)
+[4147092] [Sat Apr 18 18:34:19 2026] [warning]: Running with the internal HTML converter can result in performance issues with some HTML. Install one of the following utilities with your package manager to improve performance with an external tool: w3m, elinks, links, html2text, lynx (/usr/share/request-tracker5/lib/RT/Interface/Email.pm:1529)
 Now inserting data.
 Done inserting data.
 Done.
@@ -2389,7 +2421,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../rt-extension-customfieldsonupdate_1.03-3_source.changes
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../rt-extension-customfieldsonupdate_1.03-3_source.changes
 dpkg-buildpackage: info: source package rt-extension-customfieldsonupdate
 dpkg-buildpackage: info: source version 1.03-3
 dpkg-buildpackage: info: source distribution unstable
@@ -2499,8 +2535,8 @@
 Couldn't load RT config file /etc/request-tracker4/RT_SiteConfig.d/51-dbconfig-common.pm:
 
 Can't locate /etc/request-tracker4/RT_SiteConfig.d/51-dbconfig-common.pm:   /etc/request-tracker4/RT_SiteConfig.d/51-dbconfig-common.pm: Permission denied at /usr/share/request-tracker4/lib/RT/Config.pm line 1437.
-Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt4-extension-customfieldsonupdate/usr/share/request-tracker4/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/AfterWorked
 Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt4-extension-customfieldsonupdate/usr/share/request-tracker4/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/BeforeUpdate
+Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt4-extension-customfieldsonupdate/usr/share/request-tracker4/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/AfterWorked
 make[2]: Leaving directory '/build/reproducible-path/rt-extension-customfieldsonupdate-1.03'
 make[2]: Entering directory '/build/reproducible-path/rt-extension-customfieldsonupdate-1.03'
 Manifying 1 pod document
@@ -2515,8 +2551,8 @@
 Couldn't load RT config file /etc/request-tracker5/RT_SiteConfig.d/51-dbconfig-common.pm:
 
 Can't locate /etc/request-tracker5/RT_SiteConfig.d/51-dbconfig-common.pm:   /etc/request-tracker5/RT_SiteConfig.d/51-dbconfig-common.pm: Permission denied at /usr/share/request-tracker5/lib/RT/Config.pm line 2427.
-Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt5-extension-customfieldsonupdate/usr/share/request-tracker5/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/AfterWorked
 Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt5-extension-customfieldsonupdate/usr/share/request-tracker5/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/BeforeUpdate
+Installing /build/reproducible-path/rt-extension-customfieldsonupdate-1.03/debian/rt5-extension-customfieldsonupdate/usr/share/request-tracker5/plugins/RT-Extension-CustomFieldsOnUpdate/html/Callbacks/CustomFieldsOnUpdate/Ticket/Update.html/AfterWorked
 make[2]: Leaving directory '/build/reproducible-path/rt-extension-customfieldsonupdate-1.03'
 make[1]: Leaving directory '/build/reproducible-path/rt-extension-customfieldsonupdate-1.03'
    dh_installdocs
@@ -2541,12 +2577,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3968691/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/3326024 and its subdirectories
-I: Current time: Sun Mar 16 00:07:07 -12 2025
-I: pbuilder-time-stamp: 1742126827
+I: removing directory /srv/workspace/pbuilder/3968691 and its subdirectories
+I: Current time: Sun Apr 19 08:35:11 +14 2026
+I: pbuilder-time-stamp: 1776537311