Looks like a difference of 11ms, so less than one frame.
This is most likely to be a buggy app (or toolkit) as the message
suggests. Please try to identify what the offending app is. For example
if the window ID is still 0xa0000e then:
xwininfo -id 0xa0000e
or
xprop -id 0xa0000e | grep _NET_WM_PID
** Package changed: gnome-shell (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1973583
Title:
gnome-shell[200033]: Window manager warning: last_user_time
(394951544) is greater than comparison timestamp (394951533). This
most likely represents a buggy client sending inaccurate timestamps in
messages such as _NET_ACTIVE_WINDOW. Trying to work around... maj 16
10:33:15 graf gnome-shell[200033]: Window manager warning: 0xa0000e
appears to be one of the offending windows with a timestamp of
394951544. Working around...
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