I'm starting a new save with Pneumatic Transport mod and notice that when using this mod, when destroying an fluid intake/outake from the mod, it leaves a invisible entity that can't be removed by any mean, you can't do anything except disable this mod, remove them and activate it again
The problem may be tied to the exp buffer of those entities, for some reason non lvl'd entities (for example in Pneumatic transport, the Item Liquifier) work perfectly, but when they have level and you remove them, is when a ghost entity is created