If you try to swap layers with an infinity pipe in the cursor (including ghosts) you get this error:
The mod Actual Underground Pipes (0.1.18) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event the-one-mod-with-underground-bits::tomwub-swap-layer (ID 295)
Unknown item name: tomwub-infinity-pipe
stack traceback:
[C]: in function 'set_stack'
__the-one-mod-with-underground-bits__/control.lua:304: in function <__the-one-mod-with-underground-bits__/control.lua:237>