I was walking around and the ground was stuttering and then I just fell through the world. I was looking for a stronghold because an eye of ender was leading me there.
The weirdest thing about this bug is that I saw a pilligar tower underground while I was falling, This only occurs after the nether update.

Update: This happened in a different world but in the nether, I saw a bastion and the piglins would fall in the void as soon as they spawned.

Note: I was only a few thousand blocks away from spawn, like 3000 or something close to that.