So I started my usual Brandenburg game and about 30 years into the game (after succesfully fabricating a core on Pommern) I figured it was time to annex them. I was allied with Poland, and I thought they would keep Bohemia in check. Unluckily for me, Poland had Pommerania in their sphere so I was in a war against Saxony, Bohemia, Poland and Pommerania with only Anhalt helping me.
Since the AI is rather stupid and likes to park their doomstacks on my territory until dissolving into groups of like 2312/1732 from the orginal 9000/23000 they were mostly easy pickings, even if they never had any problem with just sending new doomstacks which they seemingly create out of thin air while late into the war (about 8 years in) I was essentially walking on my teeth in terms of manpower.
I managed to convince Poland (who had already annexed Mazovia and inherted Lithuania) to settle for an offering of 50 ducats, but about a year later I had a backstab event. Which is probably new with the latest version. Now, I generally don't mind the idea, but it does seem rather frequent. Because right after annexing Pommerania I pretty much immediately settled for white peace with Bohemia...except that maybe half a year later they rejoined the war in yet another backstab event.
Does that even have any negative repercussions for them? They certainly didn't take any stability hits from breaking the truce.
Anyway, for now it's forming another core and recovering from the 13 war exhaustion. Hoping I'll get a veteran's home.