At first I thought it's just a glitch, until I found several places with this problem. It's more likely to happen with the lava sea setting "on".

My lava blocks said:"Yay!! I can finally fly! XD"
Just kidding~

Attached 6/24
They're almost EVERYWHERE!!! :I
Actually I haven't found a place that works all right now LOL XD
Seed: 108181935
Biome: Mesa
Lava ocean on.

And..... Why do squids keep spawning in those hot tubs??!!