SUMMARY
Crashes every time when hitting "Apply", even if there are no changes or if there are no rules.

SOFTWARE/OS VERSIONS
Operating System: Fedora 34
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Kernel Version: 5.13.12-200.fc34.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 6 × AMD Phenom(tm) II X6 1090T Processor
Memory: 15.6 GiB of RAM
Graphics Processor: AMD Radeon ™ RX 470 Graphics

BACKTRACE
Application: System Settings (systemsettings5), signal: Segmentation fault
Content of s_kcrashErrorMessage: [Current thread is 1 (Thread 0x7f76d513e940 (LWP 69706))]
[KCrash Handler]
#6  0x00007f76d7c5bf34 in QWaylandClientExtensionPrivate::handleRegistryGlobal (data=0x55bcf4ffbed0, registry=0x55bcf4510f20, id=57, interface=..., version=1) at global/qwaylandclientextension.cpp:67
#7  0x00007f76d7c48419 in QtWaylandClient::QWaylandDisplay::registry_global (this=<optimized out>, id=<optimized out>, interface=..., version=<optimized out>) at /usr/src/debug/qt5-qtwayland-5.15.2-7.fc34.x86_64/src/client/qwaylanddisplay.cpp:397
#8  0x00007f76d7c647c3 in QtWayland::wl_registry::handle_global (data=0x55bcf4511960, object=<optimized out>, name=57, interface=0x55bcf5284ec0 "org_kde_kwin_blur_manager", version=1) at /usr/src/debug/qt5-qtwayland-5.15.2-7.fc34.x86_64/src/client/qwayland-wayland.cpp:94
#9  0x00007f76d5514c04 in ffi_call_unix64 () at ../src/x86/unix64.S:76
#10 0x00007f76d5514107 in ffi_call (cif=cif@entry=0x7ffe0c3d85f0, fn=<optimized out>, rvalue=<optimized out>, rvalue@entry=0x0, avalue=avalue@entry=0x7ffe0c3d86c0) at ../src/x86/ffi64.c:525
#11 0x00007f76d7bb5d10 in wl_closure_invoke (closure=closure@entry=0x55bcf5284de0, target=<optimized out>, target@entry=0x55bcf4510f20, opcode=opcode@entry=0, data=<optimized out>, flags=<optimized out>) at ../src/connection.c:1018
#12 0x00007f76d7bb642b in dispatch_event (display=display@entry=0x55bcf4515570, queue=<optimized out>, queue=<optimized out>) at ../src/wayland-client.c:1452
#13 0x00007f76d7bb661c in dispatch_queue (queue=0x55bcf4515640, display=0x55bcf4515570) at ../src/wayland-client.c:1598
#14 wl_display_dispatch_queue_pending (display=0x55bcf4515570, queue=0x55bcf4515640) at ../src/wayland-client.c:1840
#15 0x00007f76d7c407a3 in QtWaylandClient::QWaylandDisplay::flushRequests (this=0x55bcf4511950) at /usr/src/debug/qt5-qtwayland-5.15.2-7.fc34.x86_64/src/client/qwaylanddisplay.cpp:222
#16 0x00007f76da246ce0 in doActivate<false> (sender=0x55bcf45a2c70, signal_index=3, argv=0x7ffe0c3d8990) at kernel/qobject.cpp:3898
#17 0x00007f76da241c27 in QMetaObject::activate (sender=sender@entry=0x55bcf45a2c70, m=m@entry=0x7f76da4e6440 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffe0c3d8990) at kernel/qobject.cpp:3946
#18 0x00007f76da24943a in QSocketNotifier::activated (this=this@entry=0x55bcf45a2c70, _t1=..., _t2=<optimized out>, _t3=...) at .moc/moc_qsocketnotifier.cpp:178
#19 0x00007f76da249c53 in QSocketNotifier::event (this=0x55bcf45a2c70, e=0x7ffe0c3d8a90) at kernel/qsocketnotifier.cpp:302
#20 0x00007f76dade2423 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x55bcf45a2c70, e=0x7ffe0c3d8a90) at kernel/qapplication.cpp:3632
#21 0x00007f76da213098 in QCoreApplication::notifyInternal2 (receiver=0x55bcf45a2c70, event=0x7ffe0c3d8a90) at kernel/qcoreapplication.cpp:1063
#22 0x00007f76da26511f in socketNotifierSourceDispatch (source=0x55bcf4546960) at kernel/qeventdispatcher_glib.cpp:107
#23 0x00007f76d7fa34cf in g_main_dispatch (context=0x55bcf45a2ac0) at ../glib/gmain.c:3337
#24 g_main_context_dispatch (context=0x55bcf45a2ac0) at ../glib/gmain.c:4055
#25 0x00007f76d7ff74f8 in g_main_context_iterate.constprop.0 (context=context@entry=0x55bcf45a2ac0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4131
#26 0x00007f76d7fa0c03 in g_main_context_iteration (context=0x55bcf45a2ac0, may_block=1) at ../glib/gmain.c:4196
#27 0x00007f76da264698 in QEventDispatcherGlib::processEvents (this=0x55bcf45a2790, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#28 0x00007f76da211ab2 in QEventLoop::exec (this=this@entry=0x7ffe0c3d8d00, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#29 0x00007f76da219fe4 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#30 0x000055bcf2e4b58c in main ()
[Inferior 1 (process 69706) detached]