Description:

Almost identical with  FS#76053 . Rebuilding qgnomeplatform-qt6 probably resolves this bug.

Maybe it's necessary to ensure qgnomeplatform-qt{5,6} got rebuilt EVERY TIME qt{5,6}-wayland upgrades.

Additional info:
* package version(s)

qgnomeplatform-qt6 0.9.0-2 (Last upgraded 2022-09-29)
qt6-wayland 6.4.0-1 (Last upgraded 2022-10-01)
(Example app using Qt6) qbittorrent 4.4.5-1

* config and/or log files etc.

GDB backtrace with QBittorrent in GNOME Wayland session:

#0 0x00007f0e4ad437a1 in QGnomePlatformDecoration::forceRepaint() () at /usr/lib/qt6/plugins/wayland-decoration-client/libqgnomeplatformdecoration.so
#1 0x00007f0e4ad43c18 in QGnomePlatformDecoration::updateButtonHoverState(Button) () at /usr/lib/qt6/plugins/wayland-decoration-client/libqgnomeplatformdecoration.so
#2 0x00007f0e4ad44004 in QGnomePlatformDecoration::processMouseTop(QtWaylandClient::QWaylandInputDevice*, QPointF const&, QFlags<Qt::MouseButton>, QFlags<Qt::KeyboardModifier>) () at /usr/lib/qt6/plugins/wayland-decoration-client/libqgnomeplatformdecoration.so
#3 0x00007f0e4ad44369 in QGnomePlatformDecoration::handleMouse(QtWaylandClient::QWaylandInputDevice*, QPointF const&, QPointF const&, QFlags<Qt::MouseButton>, QFlags<Qt::KeyboardModifier>) () at /usr/lib/qt6/plugins/wayland-decoration-client/libqgnomeplatformdecoration.so
#4 0x00007f0e641c30c7 in QtWaylandClient::QWaylandWindow::handleMouseEventWithDecoration(QtWaylandClient::QWaylandInputDevice*, QtWaylandClient::QWaylandPointerEvent const&) () at /usr/lib/qt6/plugins/platforms/../../../libQt6WaylandClient.so.6
#5 0x00007f0e641c34de in QtWaylandClient::QWaylandWindow::handleMouse(QtWaylandClient::QWaylandInputDevice*, QtWaylandClient::QWaylandPointerEvent const&) () at /usr/lib/qt6/plugins/platforms/../../../libQt6WaylandClient.so.6
#6 0x00007f0e641a66e8 in QtWaylandClient::QWaylandInputDevice::Pointer::flushFrameEvent() () at /usr/lib/qt6/plugins/platforms/../../../libQt6WaylandClient.so.6
#7 0x00007f0e69d054f6 in () at /usr/lib/libffi.so.8
#8 0x00007f0e69d01f5e in () at /usr/lib/libffi.so.8
#9 0x00007f0e69d04b73 in ffi_call () at /usr/lib/libffi.so.8
#10 0x00007f0e69d1a645 in () at /usr/lib/qt6/plugins/platforms/../../../libwayland-client.so.0
#11 0x00007f0e69d1ae03 in () at /usr/lib/qt6/plugins/platforms/../../../libwayland-client.so.0
#12 0x00007f0e69d1affc in wl_display_dispatch_queue_pending () at /usr/lib/qt6/plugins/platforms/../../../libwayland-client.so.0
#13 0x00007f0e6418fef6 in QtWaylandClient::QWaylandDisplay::flushRequests() () at /usr/lib/qt6/plugins/platforms/../../../libQt6WaylandClient.so.6
#14 0x00007f0e67f38eb0 in QObject::event(QEvent*) () at /usr/lib/libQt6Core.so.6
#15 0x00007f0e6973cb5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt6Widgets.so.6
#16 0x00007f0e67ef7408 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt6Core.so.6
#17 0x00007f0e67ef75db in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () at /usr/lib/libQt6Core.so.6
#18 0x00007f0e6811c608 in () at /usr/lib/libQt6Core.so.6
#19 0x00007f0e6761881b in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#20 0x00007f0e6766eec9 in () at /usr/lib/libglib-2.0.so.0
#21 0x00007f0e676170d2 in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#22 0x00007f0e6811a602 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#23 0x00007f0e67f027b4 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt6Core.so.6
#24 0x00007f0e67efa02b in QCoreApplication::exec() () at /usr/lib/libQt6Core.so.6
#25 0x000055cca3653b1c in ()
#26 0x00007f0e678c8290 in () at /usr/lib/libc.so.6
#27 0x00007f0e678c834a in __libc_start_main () at /usr/lib/libc.so.6
#28 0x000055cca365b805 in ()

* link to upstream bug report, if any

N/A

Steps to reproduce:

1. Install qbittorrent
2. Open QBittorrent in GNOME Wayland session, and move your mouse cursor to maximum/minimum/close button in decoration