Originally Posted by Salo
Made several improvements to the Poltergeist enemy: they are now revealed on being attacked or hit with Radiant Spirit Guardians; they will not turn Invisible again if they are still in a character's See Invisibility aura; in Balanced and Explorer Mode, they have disadvantage on Dexterity Saving Throws when Invisible; the range of their attacks has been reduced; and they won't try to keep distance from the player in combat so that they are easier to find.

translation = this should not happen unless you are playing on tactician

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Luke Skywalker: I don't, I don't believe it.
Yoda: That is why you failed.