@swagopotamus I know but if someone were to then enter easy after loading the manion in on peacful the mobs won’t spawn, rendering the mansion useless.
*P.S. I forgot to say I’m still on 1.21.70
I’ve found a block duplication glitch involving this (due to being lag based its unlikely to be exploited) when you run into the ghost block place something on the tile. The block will be converted into whatever the last block was without using the item from your inventory. Breaking the block (without lag) gives it back to you.
It's not a glitch. There's a bug report saying the opposite and is marked as resolved.
Player cannot jump while crawling
But if, after loading the mansion’s chunks, if the difficulty were to be changed to easy, normal or hard the mobs would not spawn. There should be a way to get the mobs to spawn once the difficulty is changed.