SUMMARY
After any authentication attempt (successful or not), polkit-kde-authentication-agent-1 segfaults.

STEPS TO REPRODUCE
1. Run `journalctl --user -f -u plasma-polkit-agent.service` in a terminal to obtain log messages (keep this running)
2. Perform any action that requires polkit authentication (for example, run `pkexec true` in a second terminal)
3. Finish or cancel the authentication

OBSERVED RESULT
As evidenced by the log messages showing up in the terminal from the first step, polkit-kde-authentication-agent-1 terminates as the result of a segmentation fault.

EXPECTED RESULT
The polkit agent keeps running, ready to accept another authentication request.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0

ADDITIONAL INFORMATION
Backtrace (please tell me if you need a better one):
#0  0x00007ffff51d33c4 in QObject::deleteLater() ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#1  0x0000000000409d31 in PolicyKitListener::finishObtainPrivilege (this=0x7c8660)
    at /build/polkit-kde-agent-1-6.0.4/policykitlistener.cpp:205
#2  0x00007ffff51e4f10 in void doActivate<false>(QObject*, int, void**) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#3  0x00007ffff51e4f10 in void doActivate<false>(QObject*, int, void**) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#4  0x00007ffff72456df in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#5  0x00007ffff719dc13 in QQmlObjectOrGadget::metacall(QMetaObject::Call, int, void**) const ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#6  0x00007ffff704d14e in QV4::CallPrecise(QQmlObjectOrGadget const&, QQmlPropertyData const&, QV4::ExecutionEngine*, QV4::CallData*, QMetaObject::Call) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#7  0x00007ffff704f771 in QV4::QObjectMethod::callInternal(QV4::Value const*, QV4::Value const*, int) const ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#8  0x00007ffff70a8719 in QV4::Moth::VME::interpret(QV4::JSTypesStackFrame*, QV4::ExecutionEngine*, char const*) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#9  0x00007ffff70aba67 in QV4::Moth::VME::exec(QV4::JSTypesStackFrame*, QV4::ExecutionEngine*) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#10 0x00007ffff6ff590e in QV4::doCall(QV4::Function*, QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext*) () from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#11 0x00007ffff6ff60bb in QV4::Function::call(QObject*, void**, QMetaType const*, int, QV4::ExecutionContext*) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#12 0x00007ffff715bbb5 in QQmlJavaScriptExpression::evaluate(void**, QMetaType const*, int) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#13 0x00007ffff70fe895 in QQmlBoundSignalExpression::evaluate(void**) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#14 0x00007ffff70ff270 in QQmlBoundSignal_callback(QQmlNotifierEndpoint*, void**) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#15 0x00007ffff71883da in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Qml.so.6
#16 0x00007ffff51e4658 in void doActivate<false>(QObject*, int, void**) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#17 0x00007ffff76c0bff in QQuickWindowQmlImpl::visibleChanged(bool) ()
   from /nix/store/d6q42lq8m8sskbn17hjq75xwdyai7jfl-qtdeclarative-6.7.0/lib/libQt6Quick.so.6
#18 0x00007ffff51e4cc3 in void doActivate<false>(QObject*, int, void**) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#19 0x00007ffff5a2da42 in QWindow::visibleChanged(bool) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Gui.so.6
#20 0x00007ffff5a32dea in QWindow::setVisible(bool) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Gui.so.6
#21 0x00007ffff51d6a44 in QObject::event(QEvent*) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#22 0x00007ffff6394d11 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Widgets.so.6
#23 0x00007ffff5181ea0 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#24 0x00007ffff5185ab1 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#25 0x00007ffff544e023 in postEventSourceDispatch(_GSource*, int (*)(void*), void*) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#26 0x00007ffff4f12744 in g_main_dispatch (context=context@entry=0x7fffec000ef0) at ../glib/gmain.c:3476
#27 0x00007ffff4f15797 in g_main_context_dispatch_unlocked (context=0x7fffec000ef0) at ../glib/gmain.c:4284
#28 g_main_context_iterate_unlocked (context=context@entry=0x7fffec000ef0, block=block@entry=1,
    dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4349
#29 0x00007ffff4f15d8c in g_main_context_iteration (context=0x7fffec000ef0, may_block=1) at ../glib/gmain.c:4414
#30 0x00007ffff544d8dc in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#31 0x00007ffff518ec53 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#32 0x00007ffff518adc6 in QCoreApplication::exec() ()
   from /nix/store/az08nlbvpaxrgl07scysk36vscpxkzx4-qtbase-6.7.0/lib/libQt6Core.so.6
#33 0x000000000040814a in main (argc=<optimized out>, argv=<optimized out>)
    at /build/polkit-kde-agent-1-6.0.4/main.cpp:80