It appears that SE adds collision mask "space_tile" to all entities placeable in space.
So even if the normal pipes get excluded from that, the space pipes will still be affected.
From some attempts at digging into code:
- AUP needs to load after SE
- potentially needs to add an underground pipe specific layer for space pipes(sketchy part, I just slapped it into SE mod files as a stopgap), and remove "space_tile" from collision mask of "tomwub-" pipes. Haven't succedeed at step 2 tho.
Might need SE-specific version of the mod(for load order reasons, either name to start with later letter of alpha et than "s" or to list SE as hard dependency to load after)