Hey again,
Thanks for implementing my Space Exploration compatibility suggestion so quickly!
We have noticed a further pair of presumably related issues: 1) landfill cannot be placed within a certain radius of a wind turbine, and 2) wind turbines cannot be built on landfill. We are playing with Space Exploration and Krastorio 2.

Not being able to place landfill is probably due to the nature of how the collision box is implemented. I am not sure I can do anything about that. As for being placeable on landfill I will look into it. I was also thinking about maybe making them placeable on water but I am not sure about that yet. That might also not look good with the current sprites.

No worries, and thanks. The first issue is pretty easy to work around (just dismantle the wind turbine, place the landfill, and replace the turbine).

Didn't think of this workaround before, but I tried it out today and it's kinda obvious in retrospect: the wind turbines can be built on landfill if the landfill is paved (such as with concrete or stone bricks). So that works out nicely for now.

What about changing "resource-layer" in all collision masks to some unused layer like "layer-14"? It fix issues with landfill, but allows turbines to be placed on resources.

That might work. https://wiki.factorio.com/Types/CollisionMask

Though for consistency I might have to think about how to do this properly. Thanks for pointing it out! I hope I can get back into Factorio modding soon.