Party stuffs is pretty weird altogether. Party list sometimes doesn't release members left or refresh correctly, and often stealth thinks it's in party when it isn't (Requires manually joining and leaving a party to refresh). I noticed the partysay issue a few months back and reported it as a bug, as I didn't have much use for it though I never looked back into it. I wouldn't hold my breath for Viz as I'm sure he is busy with current Russian conflicts which greatly outweighs Stealth, however I could be wrong also, it's always worth attempting to contact him, just don't be surprised if he doesn't respond or doesn't have time to handle it.