Bevel does not mark seams

I create uv unwrapping on a cube. Doing a unwrap. Apply the bevel modifier. After applying the bevel, some chamfer angles are not marked. Can this be fixed.

cube.blend (4.7 MB)

I’m asking myself: why chamfer? Do you wana have a seam in the UVs? Then do after applying. Anyway: the bevel modfier breaks the/any marked edges…yes… because how should it decide? You can see if one edge is inserted between edges it has no mark → maybe okat but if two edges inserted: no mark → not okay… it just “doubles” the marked edges and move them and insert non marked edges inbetween…

Thank you. I will do so.