Have had them in all three. All the patches are installed, but not using any mods/cheats or even in-game cheats. The RNG can be a right bastard sometimes.
Non-spawning can be tested if a player has the Book of Girls. Using the BoG is treated as leaving the map, and closing as entering it again. So gobbos (and ravens) on a map will respawn if you open & close the BoG. Note that spawns appear in their start spots so the BoG could be used to get rid of pursuers. Or force respawn checks to remove something you don't want.