Description of problem:

I was using Plasma 5.19.4 on Wayland in Fedora 33. I set the desktop to use the Application Menu by right-clicking on the button at the bottom left of the screen, selecting Show Alternatives > Application Menu > Switch. I quickly left-clicked to open the Application Menu more than 20 times. The Task Manager at the bottom of the screen disappeared and reappeared automatically. plasmashell aborted with the message The Wayland connection experienced a fatal error: Invalid argument

Aug 19 07:33:06 plasmashell[7233]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:06 plasmashell[7233]: qt.qpa.wayland: Wayland does not support QWindow::requestActivate()
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:06 plasmashell[7233]: kf.plasma.quick: Couldn't create KWindowShadow for PlasmaQuick::Dialog_QML_183(0x55cfa49ab270, name="popupWindow")
Aug 19 07:33:07 plasmashell[7233]: The Wayland connection experienced a fatal error: Invalid argument

Application: Plasma (plasmashell), signal: Aborted

[KCrash Handler]
#4  __GI_raise (sig=<optimized out>) at ../sysdeps/unix/sysv/linux/raise.c:49
#5  0x00007f47478438a4 in __GI_abort () at abort.c:79
#6  0x00007f4747c65a7f in qt_message_fatal (message=<synthetic pointer>..., context=...) at global/qlogging.cpp:1914
#7  QMessageLogger::fatal (this=this@entry=0x7fffc8df3260, msg=msg@entry=0x7f4736413dc8 "The Wayland connection experienced a fatal error: %s") at global/qlogging.cpp:893
#8  0x00007f47363a3640 in QtWaylandClient::QWaylandDisplay::checkError (this=<optimized out>) at /usr/include/qt5/QtCore/qlogging.h:90
#9  0x00007f47363a368e in QtWaylandClient::QWaylandDisplay::flushRequests (this=0x55cfa32d54a0) at qwaylanddisplay.cpp:209
#10 0x00007f4747e5dfb0 in doActivate<false> (sender=0x55cfa32fae50, signal_index=4, argv=0x7fffc8df3340, argv@entry=0x0) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:395
#11 0x00007f4747e587f8 in QMetaObject::activate (sender=sender@entry=0x55cfa32fae50, m=m@entry=0x7f47480e6ee0 <QAbstractEventDispatcher::staticMetaObject>, local_signal_index=local_signal_index@entry=1, argv=argv@entry=0x0) at kernel/qobject.cpp:3930
#12 0x00007f4747e2baf7 in QAbstractEventDispatcher::awake (this=this@entry=0x55cfa32fae50) at .moc/moc_qabstracteventdispatcher.cpp:149
#13 0x00007f4747e7abac in QEventDispatcherGlib::processEvents (this=0x55cfa32fae50, flags=...) at kernel/qeventdispatcher_glib.cpp:430
#14 0x00007f4747e2d91b in QEventLoop::exec (this=this@entry=0x7fffc8df3460, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:136
#15 0x00007f4747e355a6 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:118
#16 0x000055cfa15b9705 in main (argc=<optimized out>, argv=0x7fffc8df3670) at /usr/src/debug/plasma-workspace-5.19.4-2.fc33.x86_64/shell/main.cpp:224
[Inferior 1 (process 7233) detached]

Version-Release number of selected component (if applicable):
plasma-workspace-5.19.4-2.fc33.x86_64
plasma-wayland-protocols-1.1.1-1.fc33.x86_64
kf5-kwayland-5.73.0-1.fc33.x86_64
qt5-qtbase-5.14.2-8.fc33.x86_64

How reproducible:
I've seen plasmashell abort 3 times with this error. The crash occurred a low proportion of times I've clicked on the Application Menu Button

Steps to Reproduce:
1. Boot a Fedora 33 KDE Plasma installation with kwin-wayland, plasma-workspace-wayland, and their dependencies installed
2. Log in to Plasma on Wayland from sddm
3. set the desktop to use the Application Menu by right-clicking on the menu button at the bottom left of the screen, selecting Show Alternatives > Application Menu > Switch. 
4. quickly left-click to open the Application Menu until plasmashell crashes.

Actual results:
plasmashell aborted with the error The Wayland connection experienced a fatal error: Invalid argument

Expected results:
No crash would happen.

Additional info:

I reported this problem at https://bugs.kde.org/show_bug.cgi?id=424879
David Edmundson wrote "Can you confirm your version of plasma-wayland-protocols please" there. plasma-wayland-protocols wasn't installed the first time I saw plasmashell crash with this error. I installed plasma-wayland-protocols-1.1.1-1.fc33.x86_64 which was present during the last 2 crashes. 

plasmashell segmentation faulted when I've quickly left-clicked to open the Application Menu at other times in the last day with traces like those I reported at https://bugzilla.redhat.com/show_bug.cgi?id=1777733 and https://bugzilla.redhat.com/show_bug.cgi?id=1723018 The crashes might involve a race condition in which the Wayland surface of the Application menu was occasionally freed or corrupted before it was used.