This bug randomly happens on the creative server, which is a kick probably caused by some kind of connection issue. The message is something like:
"An existing connection was forcibly closed by the remote host"
It can happen as fast as 10 seconds into joining creative or as long as 20 minutes. I can reliably join again after a minute or two, but any quicker and I get kicked for "You are already on the Palace Network!"
The bug is pretty much enough to be considered game breaking; I could be chatting with friends or even talking with a staff member when all of a sudden I was disconnected. I don't think many other users experienced this issue based on when I asked.
This also started happening often recently--It was not as frequent before, and it did not even exist at all last summer.
Thank you, and have a good day.