Well, as the title says, occasionally the ground below the player turns to a 3x3 desert.
This includes water, acting like landfill.
I can't yet pinpoint what exact actions might have an influence to that yet.

The map is played offline.
Spacebook, UPS up and the mod where you can "Darth Vader fly around" are deleted.
Before deleting those i had same problem as described here:
https://mods.factorio.com/mods/primedead/ArumbasAngelBobs/discussion/6644

Is anyone else experiencing this behavior?
Are there solutions to fix it?

that is the dirt_path mod we added to make the game a little harder to play

Omg, sry didn't realise that.

I do have my little path bricked, so this now mainly happens, when walking into an obstacle for 3+ sec.
Could be abused as an early landfill. I just created a "bridge" into a lake by walking towards it xD.

Anyways, thanks.