Hello Stephan and Floris,
We have received the feedback to check if this could be caused by SMBv1 being unavailable.
http://aka.ms/smb1rs3
http://aka.ms/stopusingsmb1
I understand that you have a different behaviour on Wi-Fi than USB, so I am not sure of the relevance. Would you be able to check nonetheless as we don't have internal reproduction of this issue?
Kind regards,
Alban