Most buildings give a floating error text "cannot build on empty space" when trying to do so.
Yet the entity "pipe to ground" won't, and it will be ghost-placed as if I was holding down shift.
[Lou] pipe to ground, build on empty space
[2.0.23] pipe to ground, build on empty space
This applies to: pipe to ground, and all four tiers of the underground belt.
Re: [Lou] pipe to ground, build on empty space
possibly related: 123925