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Did you have the plasterboard work carried out as per your post from a year ago?
If not and it's held off for a year I'd be tempted to treat it with a fungicide. T tree oil works well and is natural / non toxic.
The problem is that the spores of some kinds of household mould can lie dormant for a long time so even if you have now created an atmosphere that is less hospitable to it, it can still flare up. Best thing to do is be vigilant and check regularly and clean if necessary, it may take a couple of cycles of this to fully eliminate the problem
https://www.lfgss.com/comments/14576452/
mould is back, has been at bay for a year since we cleaned it up, got a dehumidifier and a tube heater for the outside walls
underside of the wooden bed slats are the worst bit, fuckin annoyin