Dell P2421DC, USB 3.1 video problem

Hi everybody!

Out of the blank my Dell P2421DC stopped displaying image via USB-C 3.1, but the integrated USB Hub still works perfectly.

No hardware modifications happened in the time period (the laptop was always connected with the stock Dell USB-C cable that came with the monitor) and there were also no software modification applied to drivers, the monitor menu was untouched and Windows Update is on hold.

FYI the laptop is a MateBook 14 from 2020 running on Windows 10 Home, version 21H2 and display output works perfectly over HDMI connection with a generic cable even when used through a third-party USB-C Hub.

Thanks in advance for the support!

Cheers, Matteo