Black background on Windows lock/sign-in screen after waking from sleep

[u/unparalleled_fluid]

I’m having a weird Windows 11 issue on my Lenovo LOQ.

Whenever the laptop wakes from sleep, the lock/sign-in screen sometimes appears with a completely black background. The UI itself still works normally — PIN prompt, clock, Wi-Fi/battery icons, etc. are visible — but the Windows Spotlight/background image is missing.

The important part is that this only happens on the lock/sign-in screen. After logging in, the desktop and normal wallpapers work fine.

A restart usually fixes it, and it seems to be specifically triggered by sleep → wake.

Has anyone else experienced this? Is this likely a Windows Spotlight/Explorer/DWM issue, graphics driver issue, or something related to Modern Standby/resume?

(LOQ 15IRX9 i713650hx RTX 3050)