If cObj executes a script that calls SetObjectStatus(C4OS_INACTIVE), C4Object::StatusDeactivate will remove the object from the main object list, freeing cLnk, causing the loop to attempt to read cLnk->Prev from freed memory.
This is what causes the crashes in the Story of Harkon, where an IntScheduleCall effect attached to the story object calls SetObjectStatus on the story object.
https://github.com/legacyclonk/LegacyClonk/blob/95e7267d4c76abaee85974cccdfdca5e651e457b/src/C4Game.cpp#L1545-L1553
If
cObjexecutes a script that callsSetObjectStatus(C4OS_INACTIVE),C4Object::StatusDeactivatewill remove the object from the main object list, freeingcLnk, causing the loop to attempt to readcLnk->Prevfrom freed memory.This is what causes the crashes in the Story of Harkon, where an
IntScheduleCalleffect attached to the story object callsSetObjectStatuson the story object.