Yes a classic case of why pva shouldn't be used to make emulsion easier to apply on bare plaster. Seems ok whilst doing it but it leaves a lot of trouble later's.
Or. maybe the first coat of emulsion was too thick, so just lay ontop of dusty plaster?
Scrape back to sound paint, use thinned emulsion to seal the bare plaster. make good with easyfill along the ridge of old/bare plaster, seal the easyfill with very thin emulsion, finish with 2 coats of your paint.
I just had to do the same to a whole room . Thought about mist coat with trade matt. But invested £ 40 in a tin of Zinsser Bullseye 1-2-3 water based primer sealer. Brilliant stuff literally saved my not sleeping in case the mist coat wasn`t up to the job
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