Comment # 22 on bug 1065388 from Ludwig Nussel

That other bug is not a duplicate and has nothing to do with usrmerge. It's
just very nasty what lmod does. lmod installs /etc/profile.d/lmod.sh which
sources /usr/share/lmod/8.7.15/init/bash. That in turn defines all kinds of
random things.
I suppose that script gets executed every single time a shell is launched,
which might be the case when lessopen.sh starts. That is basically impossible
to catch with apparmor. Messing with the shell like that should be verboten in
any case IMO.