Corrupted RCT1/RCT2 save files may contain entities with duplicate or invalid EntityIndex values and when importing these saves, CreateEntityAt returns nullptr for duplicate indices, causing a null pointer dereference crash in ImportEntityCommonProperties, this sanitises each entity's (entities?) EntityIndex to match its array position, so that CreateEntityAt always succeeds. Added unit tests too for just this case, with a crashing save file.
frozensnowy