Any compatibility breaking changes to SConsign DB / MemoryError in 4.1.0?

Hello,

We recently upgraded from SCons 3.1.2 to 4.1.0 and are facing some
"MemoryErrors" at the end of our builds (for completeness, the stack-trace
is in the end).
One hypothesis would attribute this to .sconsign.dblite incompatibilities.
Before we now introduce some clever version handling logic to purge those
files, I would like to know whether there were any changes breaking both
forward (as well as backward compatibility - in case we have to revert) of
the sconsign db files and if they would be listed in the release notes?

The only related entry in the release notes that I could find is for 4.0.0:
"NOTE: If you used Python 3.8 with SCons 3.0.0 or above, you may get a a
pickle protocol error. Remove your .sconsign.dblite. You will end up with a
full rebuild."
But we did not get such pickle errors.

Thanks,
Markus

--------------------------------------------------------------------------------
-- stack-trace of MemoryError:
--------------------------------------------------------------------------------
  scons: done building targets.
MemoryError: :
  File "<build_path>\venv\lib\site-packages\SCons\Script\Main.py", line
1380:
    _exec_main(parser, values)
  File "<build_path>\venv\lib\site-packages\SCons\Script\Main.py", line
1344:
    _main(parser)
  File "<build_path>\venv\lib\site-packages\SCons\Script\Main.py", line
1113:
    nodes = _build_targets(fs, options, targets, target_top)
  File "<build_path>\venv\lib\site-packages\SCons\Script\Main.py", line
1319:
    jobs.run(postfunc = jobs_postfunc)
  File "<build_path>\venv\lib\site-packages\SCons\Job.py", line 107:
    self.job.start()
  File "<build_path>\venv\lib\site-packages\SCons\Job.py", line 406:
    task.executed()
  File "<build_path>\venv\lib\site-packages\SCons\Script\Main.py", line 242:
    SCons.Taskmaster.OutOfDateTask.executed(self)
  File "<build_path>\venv\lib\site-packages\SCons\Taskmaster.py", line 293:
    t.built()
  File "<build_path>\venv\lib\site-packages\SCons\Node\FS.py", line 3250:
    SCons.Node.Node.built(self)
  File "<build_path>\venv\lib\site-packages\SCons\Node\__init__.py", line
797:
    self.ninfo.update(self)
  File "<build_path>\venv\lib\site-packages\SCons\Node\__init__.py", line
372:
    setattr(self, f, func())
  File "<build_path>\venv\lib\site-packages\SCons\Node\FS.py", line 3215:
    contents = self.get_contents()
  File "<build_path>\venv\lib\site-packages\SCons\Node\FS.py", line 2698:
    return SCons.Node._get_contents_map[self._func_get_contents](self)
  File "<build_path>\venv\lib\site-packages\SCons\Node\__init__.py", line
215:
    contents = fp.read()

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