Looks like this might be an extreme case of bug 1876632.
** Package changed: xwayland (Ubuntu) => mutter (Ubuntu)
** Summary changed:
- When resume from suspend, monitor keep blinking and don't show the whole
desktop.
+ [nvidia] When resume from suspend, monitor keep blinking and don't show
** Also affects: gnome-shell
Importance: Undecided
Status: New
** No longer affects: gnome-shell
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
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This video shows that what I observed.
** Attachment added: "IMG_6015.mp4"
https://bugs.launchpad.net/ubuntu/+source/xwayland/+bug/1967452/+attachment/5575459/+files/IMG_6015.mp4
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