Actually (a) might be explained if Xwayland is restarting itself on some
X error. But in Xorg terms it can restart the server anew without
exiting. So gnome-shell would see this as a crash while the Xwayland
process stays running.
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gnome-shell crashed with SIGTRAP in x_io_error() from _XIOError() from
_XEventsQueued() from XPending() from gdk_check_xpending()
["Connection to xwayland lost"]
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