[2022] Missing DLC when saving game on 3.0.x

That's odd one, that's for sure. Of course they are not going to go back and change 3.0.4 to fix this, if that's what it requires.

When you reverted did you delete the Documents/Paradox Interactive/Stellaris/ folder, or at least the cache folders in it?  

Thanks for trying that, shame it didn’t work!

I don’t really have anything else to suggest in this unique situation; I’m sure you don’t want to buy that DLC just to get past this!  

With the DLC enabled you still got errors saying it was missing? It's very hard to understand how that could be.

That was with 3.04 again, with that mod or mods?