I have a package that collects AppArmor profiles from various packages, and
found the following in
https://build.opensuse.org/public/build/home:cboltz/openSUSE_Factory/x86_64/apparmor-profile-collector/_log

...
[   15s] [754/755] cumulate os-autoinst-4.6.1589459603.638a25e2-1.1
[   15s] [755/755] cumulate openQA-worker-4.6.1589385688.c7582131b-1.1
[   15s] now installing cumulated packages
[   15s] error: failed to exec scriptlet interpreter /bin/sh: No such file or
directory
[   15s] error: %pretrans(exim-4.93.0.4-5.1.x86_64) scriptlet failed, exit
status 127
[   15s] Preparing...                          ################################
[   15s] Updating / installing...
[   15s] system-user-root-20190513-1.6         ################################
...

Note the two lines starting with "error:" - it seems the exim package needs
/bin/sh for its %pretrans script, but it's not available (yet?).