Comment # 14 on bug 1219979 from Dirk Weber

(In reply to Dr. Werner Fink from comment #13)
> (In reply to Jean-Claude Dole from comment #10)
> > I would like to point out that you did not answer my question: "What changes
> > Opensuse have made after version leap 15.4"
> > 
> > On the other hand, in your remarks you refer to systemd.
> > What systemd has to do with the Bash program.
> > 
> > Regards
> 
> Guess ... new plasma workspace version with tighten security filters in the
> environment handling, but this is a guess.  As I'm sill using fvwm (+
> lxsession + xfce4-panel)  I do not face this problem.

What has changed in Leap 15.5 is how the plasma session is started
("systemdBoot" instead of kdeinit5), see bug 1203617 comment 53.

With this change together with the Shellshock counter measure setting bash
functions in the profile becomes useless for interactive sessions. 

Or you call the functions by their Shellshock protected names...