SUMMARY
When playing Diablo 4, and alt+tabbing out of game while LibreWolf is running, KWin will crash. Running on CachyOS, with an RTX 2080 Ti. Diablo 4 is running via Steam

STEPS TO REPRODUCE
1. Start Steam
2. Login
3. Launch LibreWolf
4. Launch Diablo 4
5. Go into game
6. Alt+tab out of game

OBSERVED RESULT
KDE Plasma DE crashes before showing black TTY screen, then Plasma recovers.

EXPECTED RESULT
Expected Plasma to not crash.

SOFTWARE/OS VERSIONS
Operating System: CachyOS Linux 
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.4-4-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 64 GiB of RAM (62.7 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 2080 Ti


ADDITIONAL INFORMATION
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_wayland --wayland-fd 7 --socket wayland-0 --xwayland-fd 8 --xwayland-fd 9 --xwayland-display :0 --xwayland-xauthority /run/user/1000/xauth_ueilfa --xwayland'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f3143aa8f2b in pthread_kill () from /usr/lib/libc.so.6
[Current thread is 1 (Thread 0x7f313db41a40 (LWP 1495))]
Function(s) ^std::(move|forward|as_const|(__)?addressof) will be skipped when stepping.
Function(s) ^std::(shared|unique)_ptr<.*>::(get|operator) will be skipped when stepping.
Function(s) ^std::(basic_string|vector|array|deque|(forward_)?list|(unordered_|flat_)?(multi)?(map|set)|span)<.*>::(c?r?(begin|end)|front|back|data|size|empty) will be skipped when stepping.
Function(s) ^std::(basic_string|vector|array|deque|span)<.*>::operator.] will be skipped when stepping.
(gdb) backtrace
#0  0x00007f3143aa8f2b in pthread_kill () from /usr/lib/libc.so.6
#1  0x00007f3143a44568 in raise () from /usr/lib/libc.so.6
#2  0x00007f3143a2560d in abort () from /usr/lib/libc.so.6
#3  0x00007f31442917f4 in ?? () from /usr/lib/libQt6Core.so.6
#4  0x00007f31442927ed in QMessageLogger::fatal(char const*, ...) const () from /usr/lib/libQt6Core.so.6
#5  0x00007f31465415ad in ?? () from /usr/lib/libQt6Quick.so.6
#6  0x00007f3146723d59 in ?? () from /usr/lib/libQt6Quick.so.6
#7  0x00007f31467275f5 in ?? () from /usr/lib/libQt6Quick.so.6
#8  0x00007f3144c23b54 in QWindow::event(QEvent*) () from /usr/lib/libQt6Gui.so.6
#9  0x00007f3145701769 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt6Widgets.so.6
#10 0x00007f314437b0d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt6Core.so.6
#11 0x00007f3144bb3f97 in QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) () from /usr/lib/libQt6Gui.so.6
#12 0x00007f3144c39472 in ?? () from /usr/lib/libQt6Gui.so.6
#13 0x00007f3144c24eb9 in bool QWindowSystemInterface::handleExposeEvent<QWindowSystemInterface::DefaultDelivery>(QWindow*, QRegion const&) () from /usr/lib/libQt6Gui.so.6
#14 0x0000558bf2591d4f in ?? ()
#15 0x00007f3109ad2df1 in non-virtual thunk to PlasmaQuick::Dialog::componentComplete() ()
   from /usr/lib/libPlasmaQuick.so.6
#16 0x00007f314613d46e in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) ()
   from /usr/lib/libQt6Qml.so.6
#17 0x00007f3146103def in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) ()
   from /usr/lib/libQt6Qml.so.6
#18 0x00007f314610486e in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlRefPointer<QQmlContextData> const&)
    () from /usr/lib/libQt6Qml.so.6
#19 0x00007f31434a4176 in ?? () from /usr/lib/libQt6QmlModels.so.6
#20 0x00007f314345f26b in QQmlInstantiatorPrivate::regenerate() () from /usr/lib/libQt6QmlModels.so.6
#21 0x00007f314607f996 in ?? () from /usr/lib/libQt6Qml.so.6
--Type <RET> for more, q to quit, c to continue without paging--c
#22 0x00007f314609f1cf in ?? () from /usr/lib/libQt6Qml.so.6
#23 0x00007f314609b035 in QQmlBinding::doUpdate(QQmlJavaScriptExpression::DeleteWatcher const&, QFlags<QQmlPropertyData::WriteFlag>, QV4::Scope&) () from /usr/lib/libQt6Qml.so.6
#24 0x00007f314609cfc9 in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) ()
   from /usr/lib/libQt6Qml.so.6
#25 0x00007f314612f11d in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) ()
   from /usr/lib/libQt6Qml.so.6
#26 0x00007f31443e9c8a in ?? () from /usr/lib/libQt6Core.so.6
#27 0x00007f31474a33cf in KWin::TabBox::TabBox::show() () from /usr/lib/libkwin.so.6
#28 0x00007f31443e9e94 in ?? () from /usr/lib/libQt6Core.so.6
#29 0x00007f31443fbbe4 in QTimer::timerEvent(QTimerEvent*) () from /usr/lib/libQt6Core.so.6
#30 0x00007f31443d8339 in QObject::event(QEvent*) () from /usr/lib/libQt6Core.so.6
#31 0x00007f3145701769 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQt6Widgets.so.6
#32 0x00007f314437b0d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /usr/lib/libQt6Core.so.6
#33 0x00007f31445498b0 in QTimerInfoList::activateTimers() () from /usr/lib/libQt6Core.so.6
#34 0x00007f3144555948 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt6Core.so.6
#35 0x00007f31451a7d62 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt6Gui.so.6
#36 0x00007f3144388d76 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/libQt6Core.so.6
#37 0x00007f314438000c in QCoreApplication::exec() () from /usr/lib/libQt6Core.so.6
#38 0x0000558bf2556e53 in ?? ()
#39 0x00007f3143a27bcb in ?? () from /usr/lib/libc.so.6
#40 0x00007f3143a27c8b in __libc_start_main () from /usr/lib/libc.so.6
#41 0x0000558bf255e115 in ?? ()