I had played Ghost Town during the previous Night phase, and during my following turn, played a single Herald and then a Conspirator. Given that Ghost Town doesn't appear to be an "Action Card", it shouldn't count towards Conspirator's 2-actions-previously-played limit to turn into a cantrip, but it did.
Game #8054099, Turn 10
Reloading and looking at the log, and also undoing to that point, it behaved correctly. You played one Herald, then a Conspirator which did not draw or give action, then a second Conspirator which did. You had the actions to do this because of the Ghost Town, but it wasn't counted for the Conspirator bonus.