+1 from me as well

But I am working with fluid powered entites quite a lot, so I could give few examples

I am the author of this mod:
https://mods.factorio.com/mod/diesel_machines
this mod allows you to use machines that are powered by liquid fuels, which often clashes with mods that also try to ...

there are 2 tiles that yo can't place foundation on on gleba but only landfill

wetland-blue-slime
deep-gleba-lake

on rest of "water tiles" you can place both landfill and foundation, so I think it's a bug with landfill missing 2 "tile_condition" entries