Cannot Join certain friends in certain worlds.

This all happened months ago. I was usually playing with my friends until suddenly the host has crashed. It was normal, but when I was the only person who couldn’t join, it wouldn’t let me in when it cannot locate the server. I tried to look up multiple ways to fix this and none of them work at all. This bug had been going on for months trying to figure out how to fix this. But when I try to join the exact same friend in another world, it was working normally, so I suppose it had only affected the certain world that caused the bug. But for some reason I can join everyone else. I waited for weeks and checked if it was fixed, which it didn’t. So I decided now I needed to report the bug, since I found other methods didn’t work.