Unkillable units

Some Updates, This has happened on several soviet missions (none for cold war GDI). Many were not related to a gap generator. I had mixed success saving and reloading, the instance that spawned this post saving/loading did not fix, but other times it did.

Some of the things I noticed tending to trigger it, was spawning Spy planes on the map (a soviet only thing) while also doing group commands and spawning air drops. I think the spy planes tend to be a bit buggy and trip/trigger some lag/desync and unintended effects.

Notably, on the now infamous chronophere mission, the spy plane can trigger the fail state if it passes over the chronophere (not just scans, but passes over). Those having trouble on that mission, just don't use the spy plane at all, this worked for me (on top of the obvious, don't move near it, kill all radar domes).