Fran Moreau

I have this issue too! I just hatched a sniffer and it's invisible! Can't wait for this to be resolved! 

Mind you this is on a world that was upgraded to 1.20. Haven't tried this is a new world yet.

I have this issue too!  I was being attacked by an invisible mob! Turned out being a polar bear. I had to hide in a house then get on the roof to see it.

I have this issue too. I am traveling by boat and I have to stop and wait about 15 seconds for the area to load around me. While I wait for the blocks to load, I have a 3d view of underground and some block outlines. Another thing I've noticed is that villagers are laying down through walls oronthe ground. I wake them up so they can settle on the bed properly.