[jammy] spyder debugging not working

Expected outcome:
-----------------
Hit "Debug file" button od "Ctrl+F5" and program starts running in debugger

Actual outcome:
---------------
following line is output several times:

    [... skipped 1 hidden frame]

then debugging hangs:
> /path/to/script/code.py(3)<module>()
      1 #!/usr/bin/env python3
      2
----> 3 import mymodule
      4 import warnings
      5

Analysis:
---------
Is apparently a known bug of spyder 4:
https://github.com/spyder-ide/spyder/issues/17219
THIS BUG WILL NOT BE FIXED IN SPYDER 4

Since 22.04 is the LTS version, PLEASE backport spyder 5.x.x !!

Additional Info:
---------------
Description: Ubuntu 22.04.1 LTS
Release: 22.04

apt-cache policy
spyder:
  Installiert: 4.2.1+dfsg1-3
  Installationskandidat: 4.2.1+dfsg1-3
  Versionstabelle:
 *** 4.2.1+dfsg1-3 500
        500 http://de.archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
        500 http://de.archive.ubuntu.com/ubuntu jammy/universe i386 Packages
        100 /var/lib/dpkg/status