Comment 39 for bug 1932328

I experience this bug under Wayland in Pop!_OS 21.04, which uses a custom fork of Dash to Dock (Cosmic Dock).[*]

I found a clunky workaround:

* Select File -> Send Later (ctl-shift-enter): message is saved to Outbox.
* Select File -> Send Unsent Messages.

This method does not create a "ghost window". But it's nearly as annoying as the bug itself. I had to remove the "Send" button from the Composition toolbar to keep me from reflexively clicking it. (I should really just switch TB to run under Xwayland, but I'm pigheaded.)

[*] https://github.com/pop-os/cosmic-dock