This bug was fixed in the package sgt-launcher - 0.2.7-0ubuntu1
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sgt-launcher (0.2.7-0ubuntu1) impish; urgency=medium
* New upstream bugfix release.
- Fix: Python syntax issues (LP: #1870633)
- Fix: Embed issues in GNOME (LP: #1885411)
* d/control, d/copyright, d/watch:
Seems to be caused by sgt-launcher, which is a separate package
** Package changed: sgt-puzzles (Ubuntu) => sgt-launcher (Ubuntu)
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https://bugs.launchpad.net/bugs/1885411
Title:
sgt-pa
Note problems affect other puzzles as well and sgt-launcher seems to be
at fault. Apparently, its attempts to reparent the programs don't work
on xwayland. sgt-launcher was already killed, though, when the zombie
window wouldn't go away.
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The black window can't be killed after you close program.
Not with the X
Not will killall sgt-pattern
Not with killall -9 sgt-pattern
Not with xkill and pointing to window
Not with dash "quit"
it can be minimized or maximized or resized
I was able to kill it by xkill -id 0x897257 but that also
