The problem occurred when I introduced a high-definition mesh from Zbrush and baked the textures.Stair-like breaks now occur.
It often occurs in thin board-like models.
It didn't happen on the other parts.
How can I get rid of it?
Were you baking High to Low poly or just using High Poly as Low Poly?
Can you post the painter file?
Thanks for reply.
I baked High to Low poly.
This problem was solved in a different place.
It turned out to be because I had not applied Soften Edge and the model was too rough.
At least you have resolved it. Thanks for posting back what you found - it may help others.