Superflat worlds are much worse in void holes. In the past few days I have found over 200 more with clusters so big the floor is basically gone. NEVER DO THIS IN A FLAT WORLD AND LOG OUT BECAUSE THE FLOOR WILL DISAPPEAR.
void hole count: 370
I left my world right after making a tiny room, 64x64 blocks and only one void hole (was kinda weird) this was a brand new superflat world. I come back to see the entire floor is gone. 16 void holes. I expand the room and leave again, this time, the 16 void holes becomes 68 (52 more). All of them are in 1 massive cluster.
Void hole count: 172
MAJOR UPDATE: I did an experiment at y=-48 and a void hole DID form, y=-48 and y=-64 are both the bottom layer of chunk sections (16x16x16 parts of chunks) so I wonder if they have something to do with the bottom block of the chunk section, void hole count: 104 and counting
In the screenshot, you can see that instead of the floor being bedrock, it is deepslate
Ever since I made this, the total number of holes has gone up to 99, I have also found a few ways to prevent holes from forming
Make room at different y-level
Place at least one block on the bedrock
Remove a block of bedrock and then place it back
This is no longer a bug, this is a catastrophe, the void hole count has gone up so rapidly that it is unimaginable.
Here you can see there are a few bedrock chunks that are literally surrounded by void holes.
Void hole count: 1,032