Rescuing an old revision from bit rot: If one of fog clouds or vampire bats has been genocided and you try to polymorph a vampire disguised as the other, it won't change form because the shape it's currently in is the only candidate shape left for vampshifting. This makes shapechangers who fail to take on a new shape when polymorphed try again, specifying original form on the second try. It's unlikely to affect chameleons, but disguised vampires will sometimes become undisguised instead of seeming to be immune from polymorph.
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