[searchableguy]

> Is it worth trying DP with a DP to USB-C adapter?

No. I meant if you have a DP to USB type C cable, you may switch to see if issue resolved.

Try plugging it in and out a few times (yes, it worked for me when it went back to not recognizing).

I have the same mac but a different 4K monitor. Sadly, I don't know any other solution.

Macbook display and scaling handling on external monitors is one of the worst I have experienced by a long margin so know you are not alone.