I've been playing with this mod for a bit, and ever since I started using the processors, sometimes ghosts get built by themselves for no reason.
Looking into your code, you do revive ghosts under certain circumstances, but I can't tell exactly with which context it's supposed to work from just looking at the code.

The internals input/output revive instantly as they are placed.
If you are in Navigation Mode, all combinators are free and revived instantly to allow the player to do modifications from a distant place (the cost of a combinator is low and it does not change the balance)

Looking into it further, looks like somehow one of the fake construction robots from construction time escaped contaiment, and is now wrecking havoc on my base by building things instantly. It might have had something to do with it getting starnded in the combinator surface, and following me back to the main surface somehow, but it's probably not a problem with this mod.