Ok, got it...
It was due to the triple-buffering patch that was ignoring the pending update,
see
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1441#note_1428961
** Changed in: gnome-control-center (Ubuntu)
Status: New => Won't Fix
** Changed in: mutter (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1966178
Title:
Screen-privacy couldn't work
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