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HeyHey
Do the exterior walls have cavities?
If 'yes', debris bridging the cavity could have allowed very slight leaks through the external mortar to reach this wall.
Any evidence under the bath of a previous slight leak, (discolouration of floor boards)?
Is the detail above the window properly sealed?
Builders have remarkable faith is the waterproofness of site mixed sand/cement mixtures.
How old is the property? Back in the day wallpaper paste was any source of cellulose/starch and out of date flour was used.