I haven't reproduced this.
Is the debian bullseye image a 64 bit image? I know of one support issue where running on a 64 bit debian on a PI4, and would get bus errors. But a system update cleared up the problem before we got any debugging information. And I haven't reproduced that either.
Getting a core dump would help. If you can reproduce it, open a terminal, and run "ulimit -c unlimited" to allow coredumps, and then start up SlickEdit from that terminal, and reproduce the crash. If you get a core dump, let us know, and we'll send the instructions on how to get it to us so I can take a look at it.