A combination (two or more) of Chamfer/Fillet created by Cut extrusion (by sketch) + Chamfer/Fillet created by the Blend feature (context menu command New Chamfer/Fillet...) may lead to errors and has to be avoided (see following figures).

Of course, you can switch between different ways of creating chamfers/fillets within a model depending on the installation situation. The restriction only applies to directly intersecting edges.

The combination of one Chamfer/Fillet created by Cut extrude (by sketch) + one Chamfer/Fillet created by the Blend feature (context menu command New Chamfer/Fillet...), would be Ok, whether useful may remain open.

In this example the Blend feature had been applied first, then the Cut extrude.