Hello nouman,
an engineer from you answered me already and told me, thats a totally fine situation.
Hello jshannon,
thanks for your comment. As you mentioned, many datasheets are too extreme. Everyone writes, that the for buck, the swn is not be allowed to be below -0.3V. However, an engineer from MPS wrote me and said, its fine. About your question: Yes, the probe is compensated. I am even using a 1 GHz scope with a IsoVu probe (Isolated Probe for fast switching and low cmc error).
Again thank you both for the answers!
Kind regards
Stefan Weller