Flaky is better than mushy....I poked the drywall below the window sill and it looks a bit flaky
Wondering what I should do?
Is the wall plaster? Like when painting... pick at it until it isn't flaky. Then fix.
If the wall is GWB (rather than plaster) cut out that section. Then replace.
Do the same with those "black spots look like they were worked on painted over".