I am having same issue - no sections markers within sections in my case but I do have detail markers within sections.
Not all sections are affected, and cutting & pasting something back to same section still causes crash for me.
Good to know GS are working on it! - it this confirmed? How long have they known about it?
Cheers
PAUL KING | https://www.prime.net.nz
ArchiCAD 8-29 | Twinmotion 2025
Windoze 11 PC | Intel Core Ultra 9 285K | Nvidia Gforce RTX 5090 | 64 GB | 2x4K monitor extended desktop