iOS 14.1

I would like to report a bug concerning multiplayer games via local lan. My kids have played Minecraft on two IPADs via local lan connection together, but the multiplayer games do not work suddenly right after I updated ios to 14.1. They get a error message, "unable to connect to world" when trying to connect. They didn't have such a problem. I tried to search such the problem here with "ios 14.1" and "unable to connect to world", but I can't find a solution. Thank you for your help.