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Sorry I didn't get back to you sooner my kids kindly shared COVID with me and it's knocked me about a bit.
It sounds like what was causing the damp that affected your joists was historic and has been resolved either knowingly or otherwise at some point in the past. I can't see any sign of an ongoing damp problem in your photos although if the house has been empty for as long as you say that could disguise it. Maybe worth speaking to the neighbours again and seeing if they got to the bottom of things and if not if they've seen any sign of damp on the party wall since they had the floor fixed.
Bobbo
@Bobbo one other potentially perinent point is that for the last 10 years or so, the fridge in this house was under the stairs
edit: probs not, just had a chat with next door and their porch floor gave way a couple of years back - so perhaps a culprit in common, will investigate further!