This bug is present in GZDoom 4.14.1 and is NOT present in 4.12.2 or 4.13.2 (maybe something changed in the VisualThinker system and was not reflected in map state saving?).
I made a very simple ZScript wad that I replicate this bug with.
This wad, when run with Hexen IWAD, makes all crystal vial items emit green smoke (visibly consistently spawning visual thinkers).
vtcrash.wad- Simple ZScript WAD for replicating the bug.
- (886 Bytes) Downloaded 5 times
Replication 1 (hub revisit):
- open the attached wad with Hexen IWAD
- start MAP01
- move around for a few seconds
- warp to MAP02 (through changemap command in console - moving within a hub)
- warp back to MAP01 (again through changemap - loads hub-saved map state)
- move around for a minute or just wait, game will crash
Replication 2 (savegame load):
- open the attached wad with Hexen IWAD
- start MAP01
- move around for a few seconds
- save game
- load saved game
- game then crashes for me instantly
The game crash happens either as instant very fatal error of access violation, or the game freezes for about a minute and then goes into fatal error that it failed to realocate several gigabytes of memory...