(gdb) bt
#0  0x00007ffff41c1dbc in QV4::StaticValue::isManagedOrUndefined() const (this=0x0)
    at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/common/qv4staticvalue_p.h:315
#1  0x00007ffff421f870 in QV4::StaticValue::isManaged() const (this=0x0)
    at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/common/qv4staticvalue_p.h:320
#2  0x00007ffff4228408 in QV4::Value::as<QV4::QObjectWrapper>() const (this=0x0)
    at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/jsruntime/qv4value_p.h:133
#3  0x00007ffff42db32e in QV4::convertAndCall<QV4::ArrowFunction::virtualCall(const QV4::FunctionObject*, const QV4::Value*, const QV4::Value*, int)::<lambda(QObject*, void**, const QMetaType*, int)> >(QV4::ExecutionEngine *, const QQmlPrivate::AOTCompiledFunction *, const QV4::Value *, const QV4::Value *, int, struct {...})
     (engine=0x10ca2d0, aotFunction=0x7fffa6498370 <QmlCacheGeneratedCode::_qt_qml_org_kde_kirigami_templates_AbstractApplicationHeader_qml::aotBuiltFunctions+48>, thisObject=0x0, argv=0x7fffa4c7d5c0, argc=4, call=...) at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/jsruntime/qv4jscall_p.h:131
#4  0x00007ffff42d9499 in QV4::ArrowFunction::virtualCall(QV4::FunctionObject const*, QV4::Value const*, QV4::Value const*, int)
    (fo=0x7fffa4c7d568, thisObject=0x0, argv=0x7fffa4c7d5c0, argc=4) at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4functionobject.cpp:541
#5  0x00007ffff42279bf in QV4::FunctionObject::call(QV4::Value const*, QV4::Value const*, int) const (this=0x7fffa4c7d568, thisObject=0x0, argv=0x7fffa4c7d5c0, argc=4)
    at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/jsruntime/qv4functionobject_p.h:171
#6  0x00007ffff4241bdd in QV4::ArrayPrototype::method_reduce(QV4::FunctionObject const*, QV4::Value const*, QV4::Value const*, int)
    (b=0x7fffffff93e0, thisObject=0x7fffa4c7d550, argv=0x7fffa4c7d568, argc=2) at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4arrayobject.cpp:1418
#7  0x00007ffff42279bf in QV4::FunctionObject::call(QV4::Value const*, QV4::Value const*, int) const (this=0x7fffffff93e0, thisObject=0x7fffa4c7d550, argv=0x7fffa4c7d568, argc=2)
    at /home/diau/git/qt6-build/qtbase/include/QtQml/6.6.2/QtQml/private/../../../../../../../qt6/qtdeclarative/src/qml/jsruntime/qv4functionobject_p.h:171
#8  0x00007ffff43be491 in QV4::Moth::VME::interpret(QV4::JSTypesStackFrame*, QV4::ExecutionEngine*, char const*)
    (frame=0x7fffffffb620, engine=0x10ca2d0, code=0x7fffa63be186 <QmlCacheGeneratedCode::_qt_qml_org_kde_kirigami_templates_AbstractApplicationHeader_qml::qmlData+1558> "\030\a.\004\200\a\030\b.\005\200\b\030\006\002") at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:902
#9  0x00007ffff43ba0e8 in QV4::Moth::VME::exec(QV4::JSTypesStackFrame*, QV4::ExecutionEngine*) (frame=0x7fffffffb620, engine=0x10ca2d0)
    at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:584
#10 0x00007ffff42d0c3e in QV4::doCall(QV4::Function*, QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext*)
    (self=0x1293810, thisObject=0x7fffa4c7d500, argv=0x7fffa4c7d518, argc=0, context=0x7fffe0000bb0) at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4function.cpp:54
#11 0x00007ffff42d0dd2 in QV4::Function::call(QV4::Value const*, QV4::Value const*, int, QV4::ExecutionContext*)
    (this=0x1293810, thisObject=0x7fffa4c7d500, argv=0x7fffa4c7d518, argc=0, context=0x7fffe0000bb0) at /home/diau/git/qt6/qtdeclarative/src/qml/jsruntime/qv4function.cpp:79
#12 0x00007ffff452f393 in QQmlJavaScriptExpression::evaluate(QV4::CallData*, bool*) (this=0x132f2a0, callData=0x7fffa4c7d4e8, isUndefined=0x7fffffffb8d7)
    at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmljavascriptexpression.cpp:238
#13 0x00007ffff4421ab0 in QQmlBinding::evaluate(bool*) (this=0x132f2a0, isUndefined=0x7fffffffb8d7) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlbinding.cpp:188
#14 0x00007ffff4423c97 in QQmlBinding::doUpdate(QQmlJavaScriptExpression::DeleteWatcher const&, QFlags<QQmlPropertyData::WriteFlag>, QV4::Scope&)
    (this=0x132f2a0, watcher=..., flags=..., scope=...) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlbinding.cpp:698
#15 0x00007ffff4421948 in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) (this=0x132f2a0, flags=...) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlbinding.cpp:164
#16 0x00007ffff442351f in QQmlBinding::setEnabled(bool, QFlags<QQmlPropertyData::WriteFlag>) (this=0x132f2a0, e=true, flags=...)
    at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlbinding.cpp:619
#17 0x00007ffff457d6d4 in QQmlObjectCreator::finalize(QQmlInstantiationInterrupt&) (this=0xa9ae10, interrupt=...) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlobjectcreator.cpp:1462
#18 0x00007ffff4450a57 in QQmlComponentPrivate::complete(QQmlEnginePrivate*, QQmlComponentPrivate::ConstructionState*) (enginePriv=0x1012310, state=0x7b9668)
    at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:1156
#19 0x00007ffff4450fd1 in QQmlComponentPrivate::completeCreate() (this=0x7b95b0) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:1261
#20 0x00007ffff4450de6 in QQmlComponent::completeCreate() (this=0x7fffffffbe30) at /home/diau/git/qt6/qtdeclarative/src/qml/qml/qqmlcomponent.cpp:1239