[2022] People get stuck on the roof and die

Entities can only climb a max of one block high. You'll need to construct ladders and stairs to build higher. That way they can get up/down. Usually, I see people cut off the access back down when building a roof.

I am working on some solutions to keep them from getting stuck so much. It's a challenging thing to fix because, as a player, you don't want entities to be able to scale anything (then there's no point in having walls) but you also want them to climb things to build.