The strange diplo bug where the AI complains about a promise not to buy land that did not exist, and then starts a loop of renewing that negative modifier, is still there. I had it in a 11-17 game, Fractal large Emperor, full CBP suite.
Savegame attached. Quicksave is after the fact, the other one is just before the bug appeared.
Dutch AI came 50 turns earlier asking me not to buy more land close to them, I said NO, modifier was correctly applied, I continued to buy/steal land around them without further effect (correct), but as soon as the modifier expired (together with a promise not to SETTLE land near them), and I bought some more land, the bug appeared.
Use savegame "Bismarck-201", where the promise not to SETTLE is about to expire, the negative modifier for ignoring dutch request not to buy land just expired before this turn... wait until promise expires, one or two turns, and then buy those hills east of Stuttgart (northwest of Amsterdam), and the bug appears next turn after the purchase of land.