Yeah reading the rules I'm not sure I should have been allowed to take Karelia as part of a surrender, unless I already controlled every non-capital province.
When we played face to face we always played with the optional rule that limited major powers to never losing more than three home nation provinces total. (The rule technically only applies to major powers with players, but I think we would have applied it to all major powers without anyone noting the limitation). That might be something to think about implementing to prevent AI powers from being reduced to too tiny a rump.
Bugs
Spain just shipped corps from Tangier to Cadiz, despite not owning Cadiz (and without having access). Attached are the autosaves from both the French Naval phase before Spain's Naval phase, and the French Land phase after Spain's Land phase. It seems it isn't the first time, since their troops were also moved out in Jan.

- Screenshot 2024-07-18 031654.png (457.03 KiB) Viewed 324 times
I also expect you are aware of the phantom corps markers that are often displayed in the corps display after the real corps markers. It's not a new bug, they were present in the release version many years ago. But I've never seen quite this many French first corps. Any idea how fixable this is?

- Screenshot 2024-07-18 020230.png (20.67 KiB) Viewed 324 times
Edit:
I've also been noticing odd movement paths for corps adjacent to water for most of this game, without actually bothering to open the AAR option and screenshot the actual path the unit took. As far as I can remember it has never allowed me to move anywhere I could not have reached normally, but mentioning anyway.

- Screenshot 2024-07-18 033420.png (363.68 KiB) Viewed 320 times
Thanks Bill for your work on Empire in Arms.