Not entirely uncommon with some high profile individuals, Sepp Dietrich I think had a reputation for doing what he wanted to do. With (if I remember the incident correctly) his being given on at least one occasion either a direct order to comply with established protocols as regards dress sidearms. Or his failure to comply which prompted his being censured.
But what the period photos of dress bayonets in use do not show are the blade markings. And given the lack of sharpness in detail of most, I don’t know how you could tell if it was a preexisting Imperial era dress bayonet, versus a Third Reich era manufactured blade? FP
