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Pretty self-explanatory I think. I'd expect those placement indicators to be above the ore so I can see where I can place a pump.

Thanks for the report.
This is because there is lot of tiles to check for pump buildability, so it is done as part of tile renderer which already reads tiles so it is more efficient for memory-access to also do the pump buildability checks and tile renderer caches its work so the checks don't need to be done every frame.
But sometime we could actually move it to anywhere else, and add some caching for it.
For now, minor issue.