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First floor bedroom and single brick wall, so if there are pipes you know where they are. No wall ties either.
The brick feels dry so it seems like its just the lime plaster (if that is lime plaster) and then subsequently the gypsum is damp. Lack of breathability is I'm sure an issue, but why just this spot 🤔
Old gas or water pipe coming from under the slab? Or a wall tie that's bonded to the exterior wall with cracked grouting with moisture migrating?