Gonna jump on the bandwagon. This affects both my switch and PC versions of bedrock in Realms.
I'll add that if I move away from the sign by several hundred blocks and return, the sign is blank when it's reloaded.
For me the boat is invisible and can't be interacted with. However, other players can see and interact with the boat. The boat reappears after logging off the Realm server and logging back in.
Gonna jump on the bandwagon. This affects both my switch and PC versions of bedrock in Realms.
I'll add that if I move away from the sign by several hundred blocks and return, the sign is blank when it's reloaded.