I've noticed that the endgame crisis factions seem to have a lot of issues - I'm just finding more and more problems with them that I've decided put down a list of problems here.

1. Endgame crisis not purging
   
   The problem here is that the job "crisis_purge" in "00_other_jobs.txt" now requires the global flag "galactic_crisis_happened". It didn't require this in the rollback version, 3.11, and none of the crisis have been updated to put this flag up. The scourge don't have it in their debug event "crisis.199" and the contingency do not use it at all! I've modded out the flag and they started purging properly again.
   
   
2. Scourge not colonizing properly
   
   Whenever the scourge try to colonize a planet, it instantly gets removed from their ownership. I do know at least one rollback version, 2.8, where they do colonize correctly. Your event, "ariphaos_patch.92", at least turns them to barren worlds, but I've managed to modify it and make it so that they can get their infested worlds if they exist, which should work better. I'll have the modified event at the bottom of the post. Also, can you edit "crisis.203" to check for shattered ringworlds and turn them to size 10 when they are colonized? Otherwise we get a size 25 damaged habitable ringworld which is super big.
   
   
3. Extradimensional factions not expanding
   
   The Aberrant and Vehement factions both do not use their construction ships to build new outposts, and apparently in "00_country_types.txt" its because they lack something. "invaders_interior_ministry_module" is held the Unbidden but not the other extradimensionals. This means that the Unbidden are the only one of the three that know how to use their construction ships!
   
   
4. Endgame crisis construction ships don't expand well
   
   All of the endgame crisis tend to have their ships idle if they spawn in an empty part of the galaxy, and they tend to miss corners. There's a way to make them expand better. For every crisis faction EXCEPT the scourge, replace their "..._interior_ministry_module" with "horde_interior_ministry_module". Because the Great Khan knows how to send his construction ships everywhere and the endgame crisis factions only know to send their construction ships where their ships have moved to. For the scourge, you add that module; it will make their construction ships a little janky but it will work and if you replace the module they won't colonize.

This last bit here is just a suggestion, but I feel like the extradimensionals would last a lot longer if they actually garrisoned their portal. Even the wiki still mentions "portal guards" after at least half a dozen versions of them not garrisoning. They end up leaving their home empty and nowadays an FE usually moves in and snipes their portal for you. Losing their portal system cripples them and its too easy. You can change this pretty easy by adding this here:


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These are all the problems that I've found right now. Below is the modified event that gives the scourge their colonized planets.