1.16.3 cant connect to my own realm

When I place a redstone block on top of a piston, then power it with another redstone block, then remove that redstone block, the piston remains extended for no reason.

When I load a resource pack onto the latest snapshot on 15w35b, I exit out of the game, then when I go back in, the doors appear to be invisible and some even break completely

Realms

every time i try geting into the game it comes up with a crash report