I’ve never tested after misting before & don’t really do re-decorating but I will always test old paint coverings before re-skimming or tiling over.I've never put masking tape over plaster that was mist coated over a month ago. I doubt whether any other painter and decorator or plasterer has either.
Anybody
Generally, paint is not good news with either & especially if the tiles are on the larger side; for the same reason, plaster is far from the ideal tile base either!