HostsServer

Im having the same issue now (1.17 beta) but for me its only when i open the settings menu in game it throws this same unhelpful error

Also effects the bottom 2/3 of the side walls for the lower section of the hopper wich also defaults to the first state and doesnt switch according to orientation like the top 1/3 does

This also happens with powder concrete, for me it turned the block into a ghost block where the only way to break it which they shouldnt when falling from the height i was testing at was to place blokc under the slab or break the slab wich breaks the powder block 

Video example:

https://discord.com/channels/302094807046684672/332971439554691077/839271083043323905