My impression after working with plaster products renovation since the 1970s- Your situation is less than ideal but probably not the end of the world. Clean it all up as best you can, avoid dust becoming airborne, use a HEPA filter in your HVAC for the rest of the year. You can have it tested but you risk overzealous regulation. Seal up the wall, paint, and your health risk is approaching zero. JMHO
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