I'm not sure what the actual cause of this bug is, I've reported the issue in an older ticket, but it was marked as Resolved, I'm typing out this secondary ticket to say the Bug Issue hasn't been Resolved. I'm still unable to Join my besties World. There doesn't seem to be any actual indication of what causes this Bug, as all I remember doing was working on building a plane in the sky and my bestie shut off the server while I was building it. Please Help Mojang.