LG display shows NO SIGNAL when connected with MacBook Air

The combo worked perfectly for years, all of a sudden the LG display shows NO SIGNAL.

• The LG display still delivers electricity to the MacBook Air.
• The display even shows USB C in the input list.

In System Settings -> Displays -> Option Key -> Detect Displays no displays (except for the built-in) are found.

I found an old thread from 2022, looks like the issue has not been solved. Any ideas?

Thank you very much!