Reproduction steps:
1. Open the user's attached project
2. Open "Assets/CurveDesigner/Scenes/EndlessRunnerExampleScene" Scene
3. Select GameObject "RootCurve" from the Hierarchy
4. In the "Curve3D" Script component change values of "Vertex Density" and "Ring Point Count"

Expected result: Editor doesn't crash after changing parameters
Actual result: After some time Editor throws a "Fatal error in GC: Unexpected mark stack overflow" error and crashes

Reproducible with: 2021.2.0a18, 2021.2.6f1, 2022.1.0b1
Not reproducible with: 2019.4.33f1, 2020.3.24f1, 2021.1.28f1, 2021.2.0a17

First lines of stacktrace:
x00007FF96240C496 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:1379] GC_push_all
0x00007FF96219709B (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\mono\metadata\boehm-gc.c:787] mono_push_other_roots
0x00007FF962409B3A (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:457] GC_mark_some_inner
0x00007FF9624099EB (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\mark.c:522] GC_mark_some
0x00007FF962412CAD (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:832] GC_stopped_mark
0x00007FF9623FDAEC (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:705] GC_collect_a_little_inner
0x00007FF9623FBE69 (mono-2.0-bdwgc) [C:\build\output\Unity-Technologies\mono\external\bdwgc\alloc.c:1563] GC_allocobj

Note:
- it may take a few minutes to reproduce the crash