Doomsday Engine

In some cases (investigate exactly when), mobj cross-references — links to other mobjs — are not fully restored after loading a saved game. This is particularly problematic in Hexen, where hubs use the save mechanism when switching between maps. This leads to various potential crashes and other gameplay issues because action functions may assume that certain pointers are valid even though they have been reset to null.

Savegames should use an improved mechanism that ensures all cross-references between objects (and thinkers?) are restored correctly. The private thinker IDs should be very helpful here, as they are persistent across saves.