M4 MBA cannot connect external monitor without deleting preferences

[drapestar]

Hi, I just bought a new M4 MBA and when I go to connect it to my Dell UltraWide 34" via USB-C, nothing happens -- no charging, and no display. The only way around this I've found is to delete the "com.apple.windowserver.displays.plist" preference file and restart the machine every time I connect it to the monitor. This isn't a sustainable or fun solution to do something my M1 MBA had no problem doing :/

The machine came with macOS 15.3 out of the box, and the problem didn't start until I updated to macOS 15.6.1

Any advice or suggestion? Or is this a "it'll get fixed in the next update" kind of problem?
Thank you!