Segmentation fault on MacOS 14.5 / Apple Silicon with Python 3.12.5 and FreeSimpleGUI 5.1.1

Start with the reported stack trace, especially the GUI path through pfi/tools/fplot.py at lines 414, 123, and 570, and reproduce it on macOS 14.5 with Python 3.12.5, FreeSimpleGUI 5.1.1, and the reported matplotlib versions. Compare the GUI and command-line paths around closing show(); done means the GUI path closes the plot without a segmentation fault.

I have a FreeSimpleGUI front end for a plotting utility; there is a button on the FreeSimpleGUI window that renders a plot with matplotlib show(). After closing the plot window (when show() exits), I'm getting a segmentation fault.

I can invoke the same plot via command line switches and bypass any FreeSimpleGUI rendering. In that case, after I close the show() window, no segmentation fault.

I add a faulthandler.enable() before the show(), and got this stack trace for the segmentation fault:

Fatal Python error: Segmentation fault

Current thread 0x00000001f3454c00 (most recent call first):
  File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/tkinter/__init__.py", line 1505 in mainloop
  File "/Users/elw/Development/brewmonitor-python-toolkit/.venv/lib/python3.12/site-packages/PySimpleGUI.py", line 11263 in _read
  File "/Users/elw/Development/brewmonitor-python-toolkit/.venv/lib/python3.12/site-packages/PySimpleGUI.py", line 11134 in read
  File "/Users/elw/Development/brewmonitor-python-toolkit/pfi/tools/fplot.py", line 414 in fplot_ui
  File "/Users/elw/Development/brewmonitor-python-toolkit/pfi/tools/fplot.py", line 123 in fplot_cli
  File "/Users/elw/Development/brewmonitor-python-toolkit/pfi/tools/fplot.py", line 570 in <module>
  File "<frozen runpy>", line 88 in _run_code
  File "<frozen runpy>", line 198 in _run_module_as_main

I tried PySimpleGUI-4-foss, and had the same behavior, if that helps. Matplotlib version is the most current (3.9.1.post1), but it occurred with Matplotlib 3.8.3 and 3.8.4 as well.