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ghostface
ectoplasmosis
Very similar to what happened to our bedroom bay window during the storms last year. Massive water ingress through failed external frame seals, which saturated the masonry and continues to dry out through to the interior surface, resulting in sopping wet plaster.
If this has happened in your case, no amount of dehumidifying is gonna sort it unfortunately; it’s a plaster-off job :(
Make sure the window is well-sealed externally first tho.