SUMMARY
I experienced a crash of 4 componentes in same time which resulted in restart of my desktop system.


STEPS TO REPRODUCE
1. crash and desktop restart

OBSERVED RESULT
Message: we are sorry, xdg-desktop-portal-kde closed unexpectely.
You cannot report this error because xdg-desktop-portal-kde does not provide a bug reporting address.

crash report:
Application: xdg-desktop-portal-kde (xdg-desktop-portal-kde), signal: Aborted

[KCrash Handler]
#4  0x00007ff1550a820e in raise () from /lib64/libc.so.6
#5  0x00007ff155092536 in abort () from /lib64/libc.so.6
#6  0x00007ff1554cde3f in QMessageLogger::fatal(char const*, ...) const () from /usr/lib64/libQt5Core.so.5
#7  0x00007ff153560d76 in ?? () from /usr/lib64/libQt5WaylandClient.so.5
#8  0x00007ff1535726aa in QtWaylandClient::QWaylandDisplay::flushRequests() () from /usr/lib64/libQt5WaylandClient.so.5
#9  0x00007ff1556f64bb in ?? () from /usr/lib64/libQt5Core.so.5
#10 0x00007ff1556f9907 in QSocketNotifier::event(QEvent*) () from /usr/lib64/libQt5Core.so.5
#11 0x00007ff156f1d1a1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQt5Widgets.so.5
#12 0x00007ff1556c4188 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib64/libQt5Core.so.5
#13 0x00007ff1557171b1 in ?? () from /usr/lib64/libQt5Core.so.5
#14 0x00007ff153bbfc0b in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#15 0x00007ff153c277f8 in ?? () from /usr/lib64/libglib-2.0.so.0
#16 0x00007ff153bbb494 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#17 0x00007ff15571525e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#18 0x00007ff1556c2196 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQt5Core.so.5
#19 0x00007ff1556c4729 in QCoreApplication::exec() () from /usr/lib64/libQt5Core.so.5
#20 0x000055eb4faf92dd in ?? ()
#21 0x00007ff1550937fd in __libc_start_main () from /lib64/libc.so.6
#22 0x000055eb4faf9eca in ?? ()
[Inferior 1 (process 5360) detached]


Linux/KDE Plasma: Gentoo
(available in About System)
KDE Plasma Version: 5.85.0-r3
KDE Frameworks Version: 5.22.5
Qt Version: 5.15.2-r3