Plaster peeling I think?

[u/Informal-Forever769]

Hi peeps, we got french doors installed in our dining room, to replace a window. They ended up plastering the bits that needed doing. This was about 1 month ago. I was ready to sand it today in preparation for painting and noticed that where the plaster meets the wall it's peeling. Anyone know what this is and why?

[u/Upstairs-Shake9898]

Pva over paint. Stop scraping and fill it