Intermittent green hue

Hi. I intermittently get a green hue over my whole screen, other than the tile bar at the top. Gnome variant. There’s a light green outline of this section. I run into this 1-2 times a day, and the only fix I’ve found is a reboot.

It’s as if there’s an overlay graphic covering everything but the tile bar. It’s distinct from the night mode.

Any ideas? A first step is to ID what this tint normally does. Ie, is it normally used when a high priority dialog box pops up, etc.

Screenshot, please?

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