Blur effect disappears when turning display off/on

[mangoduck]

Description

I often leave a machine for varying periods and turn off the display instead of suspending the system. The blur effect is gone when I turn the display back on, even if it was only off for a second. No artifacts, just gone, always reproducible, seemingly nothing of interest in logs. Extension must be toggled to bring it back.

Expected behavior

The blur effect should persist as long as the extension is on.

Configuration

• Gnome 3.36.3
• Ubuntu 20.04.1
• Xorg
• Radeon RX 550
• I have no way of knowing what other extensions may interact. The only other one related to compositing is "Transparent window", though that effect happily persists. All others are typical -- Dash to dock, Activities configurator, Openweather, etc.

[mangoduck]

Additionally, blur is fine after suspending, resuming, and unlocking.

[mangoduck]

New find: Resuming from standby restores blur lost from turning display off.