Resuming laptop from sleep with external monitor connected doesn't retain configuration

### What Happened?

I upgraded from Elementary 5.1 to 6.1.

My laptop's main display is running at 3200×1800 resolution with HiDPI×2. I regularly plug an external 4K monitor, which is autoconfigured just as expected (position, resolution, and HiDPI).

I put my laptop to sleep multiple times a day, by closing the lid and turning off the external monitor. Coming back later from sleep, by opening the lid and turning the external monitor on, leads to a complete reconfiguration of the displays with nonsensical values after I login:

- Both monitors are reduced to HiDPI×1;
- The main monitor displays some kind of picture in picture (the whole screen is displayed on the monitor _and_ duplicated to the top-left quarter of the monitor)
- The top-menu and dock are moved to the external monitor.

I must reach for the settings, manually modify everything (move screens around, select the main monitor, select the HiDPI) every time _multiple_ times a day.

### Steps to Reproduce

Go to sleep with external monitor connected and turn it off. Turn the computer back on and log in. Screens are a mess.

### Expected Behavior

The last known display configuration is maintained or reapplied.

This used to be working flawlessly in Elementary 5. I never had to access the display settings.

### OS Version

6.x (Odin)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

Dell XPS 15 9530 (Haswell, integrated HD Graphics 4600) with and external 4K Dell monitor.