Can't reset world to adventure map on Realms

Whenever I try to reset my world with the adventure map "Cave Game", it either finishes but doesn't actually reset the world or shows the error "Realms (500) Could not connect to Realms: Read timed out". I have been trying to load up the adventure map from the Realms adventure map list for two days now. This also happens with the Winter Haven Holiday Resort experience map. I have been able to load Cave Game before in the past, before the 1.16 update.