$ gdb python3.13
gdb > [ set breakpoint, start Python program ]
gdb > py-bt
Traceback (most recent call first):
  (unable to read python frame information)
  [ repeated ]

This works with Bookworm's python3.11.
It also works when I use the python3.13-dbg executable.

If this is not easily fixable, the python3.13-gdb.py script should print a
message (when it loads!) to the effect that the user should start py3.13-dbg
instead of wasting time.