There is another issue. (There is alway an obstacle daily.haha)
This time is Weight Paint. And I have no problems painting on other objects, this is the only object that has issues.
When I paint, it only affects the corner of the box. and it does not read this vertex group. Is it because there are no vertices on this face, it only paints on the vertex?
It paints through the box, it should be only on one side of the box. The box has Solidary and Subdivision and paper material.
How could I prevent the sprinkles from passing through the box? Thanks for your time to review and help me out! :D