The bug:

And once again I find these bird-poop microbiome when I walk around the map. Before you think this is rarely happening, NO! It's just that I don't take a screenshot of every microbiome I find, but it's happening a lot, A LOT!, A LOT! of these microbiomes, it becomes irritating. It's not a microbiome there and another one here, it's everywhere! It's bizarre, apparently Mojang doesn't even care about these issues, as they stopped trying to fix it for some time.

Well...

How to produce:
Create a new world with this seed:

SEED: -1119127451398396555

Do:

COORDS: /tp -138 178 -55

I found another one, not so bizarre, but annoying:

COORDS: /tp -326 178 -228

"Please, use creative."