It looks like, with the latest Planetfall version, that the gamebreaking bug that was meant to be fixed in 1.201 (the latest at the time of writing) that prevents the AI from finishing its turn is still in the game. However, due to me having been using mods when discovering it (since I was testing them), I cannot be certain that it wasn't caused by said mods.

My problem right now is that I got too much going on in my personal life that's leaving me too exhausted to properly test this, and so I hope there's someone else here who's willing to do the testing in my stead so we can let the developers know about it if needed.

If anyone decides to help: Thank you, I appreciate it :)
If not, then thanks for reading nonetheless :)