Just checking in to say that this is still a problem and nothing seems to fix it. I've tried every suggestion here and nothing helps. I've done a fresh Windows install that has almost nothing installed on it besides Steam and PSO2 in the first place and nope, still get these errors. I've checked the .erl files and stuff with the bot on PSO2 discord and it doesn't even find potential problems.
The only 'solution' so far has been to play on my laptop which for completely unknown reasons doesn't have this problem.