[Bug 1932328]

[U-adam-e]

Hi everyone, 
I have the same issue on my computer : Ubuntu 21.04+Wayland, TB 78.13.0. 
I would like to add that the bug impacts the whole system. On top of having phantom windows I also loose the ability of switching through open-windows with ALT+TAB, which is quite annoying… not saying totally irritating! 
The same behavior has been described on Ubuntu French Forum : https://forum.ubuntu-fr.org/viewtopic.php?pid=22484498#p22484498

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https://bugs.launchpad.net/bugs/1932328

Title:
  Thunderbird under Wayland does not correctly close (or manage) windows

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