STEPS TO REPRODUCE
1. Move default bottom panel to the left screen edge
2. Maximize a window
3. Move the pointer over the maximized window's icon in the top left corner so that its tooltip appears
4. Move the pointer leftwards so that it's over Kickoff now. The tooltip should still be visible
5. Click to open Kickoff. The tooltip should now be over part of Kickoff's popup
6. Click on the tooltip


OBSERVED RESULT
kwin_wayland crashes with the following backtrace:

#0  std::__atomic_base<QThreadData*>::load(std::memory_order) const
    (__m=std::memory_order_acquire, this=<error reading variable: Cannot access memory at address 0x8>) at /usr/include/c++/13/bits/atomic_base.h:835
#1  std::atomic<QThreadData*>::load(std::memory_order) const
    (__m=std::memory_order_acquire, this=<error reading variable: Cannot access memory at address 0x8>) at /usr/include/c++/13/atomic:577
#2  QAtomicOps<QThreadData*>::loadAcquire<QThreadData*>(std::atomic<QThreadData*> const&)
    (_q_value=<error reading variable: Cannot access memory at address 0x8>)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/thread/qatomic_cxx11.h:213
#3  QBasicAtomicPointer<QThreadData>::loadAcquire() const
    (this=<error reading variable: Cannot access memory at address 0x8>)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/thread/qbasicatomic.h:181
#4  QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x0, event=0x7ffdef845d30)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qcoreapplication.cpp:1111
#5  0x00007f163f87790d in  () at /home/nate/kde/src/kwin/src/internalwindow.cpp:106
#6  0x00007f163c807d78 in vtable for QEvent () at /lib64/libQt6Core.so.6
#7  0x000000010000000b in  ()
#8  0x00007ffdef845d60 in  ()
#9  0x000000000083acf0 in  ()
#10 0x0000000002133670 in  ()
#11 0x00007f163f8c2805 in KWin::PointerInputRedirection::focusUpdate(KWin::Window*, KWin::Window*)
    (this=0x1c893f0, focusOld=0x1c893f0, focusNow=0x7ffdef845d30)
    at /home/nate/kde/src/kwin/src/pointer_input.cpp:519
#12 0x00007f163f85a650 in KWin::InputDeviceHandler::update() (this=0x83acf0)
    at /home/nate/kde/src/kwin/src/input.cpp:3433
#13 KWin::InputDeviceHandler::update() (this=0x83acf0) at /home/nate/kde/src/kwin/src/input.cpp:3414
#14 0x00007f163f8c1a72 in QArrayDataPointer<KWin::InputEventFilter*>::constEnd() const
    (this=<optimized out>) at /usr/include/qt6/QtCore/qarraydatapointer.h:112
#15 QList<KWin::InputEventFilter*>::constEnd() const (this=<optimized out>)
    at /usr/include/qt6/QtCore/qlist.h:595
#16 KWin::InputRedirection::processFilters<std::_Bind<bool (KWin::InputEventFilter::*(std::_Placeholder<1>, KWin::MouseEvent*, unsigned int))(KWin::MouseEvent*, unsigned int)> >(std::_Bind<bool (KWin::InputEventFilter::*(std::_Placeholder<1>, KWin::MouseEvent*, unsigned int))(KWin::MouseEvent*, unsigned int)>) (function=..., this=<optimized out>) at /home/nate/kde/src/kwin/src/input.h:191
#17 KWin::PointerInputRedirection::processButton(unsigned int, KWin::InputRedirection::PointerButtonState, std::chrono::duration<long, std::ratio<1l, 1000000l> >, KWin::InputDevice*)
    (this=0x83acf0, button=272, state=KWin::InputRedirection::PointerButtonReleased, time=std::chrono::duration = { <optimized out>us }, device=<optimized out>)
    at /home/nate/kde/src/kwin/src/pointer_input.cpp:280
#18 0x00007f163c3ddb35 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
    (a=0x7ffdef8460a0, r=0x83acf0, this=0x2b314a0)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qobjectdefs_impl.h:363
#19 doActivate<false>(QObject*, int, void**) (sender=0x3c08470, signal_index=4, argv=0x7ffdef8460a0)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qobject.cpp:3992
#20 0x00007f163c3d4757 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**)
    (sender=<optimized out>, m=m@entry=0x7f163fd4f660 <KWin::InputDevice::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x7ffdef8460a0)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qobject.cpp:4052
--Type <RET> for more, q to quit, c to continue without paging--c
#21 0x00007f163f7d83bf in KWin::InputDevice::pointerButtonChanged(unsigned int, KWin::InputRedirection::PointerButtonState, std::chrono::duration<long, std::ratio<1l, 1000000l> >, KWin::InputDevice*)
    (this=<optimized out>, _t1=<optimized out>, _t2=<optimized out>, _t3=std::chrono::duration = { 29924362846us }, _t4=<optimized out>)
    at /home/nate/kde/build6/kwin/src/kwin_autogen/include/moc_inputdevice.cpp:1035
#22 0x00007f163fa43fbc in KWin::LibInput::Connection::processEvents() (this=<optimized out>)
    at /home/nate/kde/src/kwin/src/backends/libinput/connection.cpp:353
#23 0x00007f163c3cf797 in QObject::event(QEvent*) (this=0x7a6d20, e=0x7f15f4007040)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qobject.cpp:1391
#24 0x00007f163d7c0b08 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
    (this=<optimized out>, receiver=0x7a6d20, e=0x7f15f4007040)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/widgets/kernel/qapplication.cpp:3287
#25 0x00007f163c37c308 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
    (receiver=0x7a6d20, event=0x7f15f4007040)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qcoreapplication.cpp:1115
#26 0x00007f163c37c50d in QCoreApplication::sendEvent(QObject*, QEvent*)
    (receiver=<optimized out>, event=<optimized out>)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qcoreapplication.cpp:1533
#27 0x00007f163c37fd75 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*)
    (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=data@entry=0x726f50)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qcoreapplication.cpp:1895
#28 0x00007f163c4fcca6 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
    (this=0x72c220, flags=...)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/kernel/qeventdispatcher_unix.cpp:432
#29 0x00007f163d1434c2 in QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=<optimized out>, flags=...)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#30 0x00007f163c388e93 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
    (this=this@entry=0x7ffdef846580, flags=..., flags@entry=...)
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/global/qflags.h:34
#31 0x00007f163c384b3d in QCoreApplication::exec() ()
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/corelib/global/qflags.h:74
#32 0x00007f163cbf85cd in QGuiApplication::exec() ()
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/gui/kernel/qguiapplication.cpp:1894
#33 0x00007f163d7c0a79 in QApplication::exec() ()
    at /usr/src/debug/qt6-qtbase-6.5.1-2.fc38.x86_64/src/widgets/kernel/qapplication.cpp:2566
#34 0x00000000004305e8 in main(int, char**) (argc=<optimized out>, argv=<optimized out>)
    at /home/nate/kde/src/kwin/src/main_wayland.cpp:613

EXPECTED RESULT
No crash