Reproduction steps:
1. Open the attached project “CrashRepro“
2. Open the Font Asset Creator window (Window > TextMeshPro > Font Asset Creator)
3. Make sure Source Font File is “LT Diploma“
4. Click on Generate Font Atlas button in the Font Asset Creator window
5. Repeat step 4 until crash

Expected result: A font atlas is generated and displayed in the Font Asset Creator window
Actual result: Editor crashes

Reproducible with: 2021.3.27f1, 2022.3.3f1, 2023.1.1f1, 2023.2.0a4
Fixed in: 2023.2.0a5

Reproducible on: Windows 10

First few lines of Stack Trace:

{noformat}0x00007FFA8BEFA530 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\finalize.c:1000] GC_make_disappearing_links_disappear
0x00007FFA8BEF3E14 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\finalize.c:1178] GC_finalize
0x00007FFA8BEF4839 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:1087] GC_finish_collection
0x00007FFA8BEEF936 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:699] GC_collect_a_little_inner
0x00007FFA8BEED45B (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\malloc.c:57] GC_alloc_large
0x00007FFA8BEF65EF (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\malloc.c:264] GC_generic_malloc
0x00007FFA8BEFAB23 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\malloc.c:333] GC_malloc_kind {noformat}

Notes:
The reproduction rate is about 80% and usually crashes in less than 10 clicks.
There is a chance that it will throw errors in the console and not finish generating the atlas, closing the Font Asset Creator window crashes the editor
Changing the Atlas Resolution seems to affect the reproduction rate. Higher resolutions crash more consistently.