Plaster and paint peel off after painting

Help! I hope you can give me some advice. We have painstakingly redone the ceilings and walls of our old building. That means chipping away the damaged parts of the old plaster, repairing with Rotband, then Ardex 828 and sanding. The last two steps were repeated several times until everything was perfectly smooth. In some rooms, new drywall ceilings were installed. Where there were only small dents, they were only smoothed with Ardex. After filling, everything was primed with Tiefgrund and left to dry. When painting, the plaster stuck to the roller. In other rooms, we first applied crack primer and then paint; after two days, there are widespread small cracks and parts about the size of 5-cent coins are peeling off. Mainly in the corners but also on the surface. What could be the cause? The walls were completely filled and primed. Also, everything was thoroughly dried for a long time. Do you have a tip? Oh, the materials were bought from the paint specialty store for a lot of money.

What was used for painting? Silicate paint on gypsum plaster can cause problems.

Correct. If you have painted silicate paint on plaster....just do it again immediately..we had the same problem. You get annoyed constantly.

I checked again this morning, it is dispersion paint.

Would the surface be completely dry?
is an expert, as far as I know...

I do think that it was dry. Plaster was last applied about two weeks ago.