u/HelicopterKey9118

I have an old 1930s home, and the paint has lifted off from the solid plaster wall - note it did not start at the skirts it was appx a quarter way up. I have scraped it off and noticed fine crack lines on the solid plaster. I tapped it and its not drumming or wants to come off.
Are fine crack lines something I should be worried about, and what would you recommend I do to solve so the paint does not bubble off.

I have an old 1930s home, and the paint has lifted off from the solid plaster wall - note it did not start at the skirts it was appx a quarter way up. I have since scraped it off and noticed fine crack lines on the solid plaster. I tapped it and its not drumming or wants to come off.
Why did the paint do this and what would you recommend I do to solve.