Thought this was fixed? Have had to downgrade to 6.3
EndeavourOS.
This specifically is still open: 488326 – Opening System Settings to Mouse or Networks KCM breaks other pages afterwards: InlineMessage.qml:123 Cannot assign object of type "TP.IconPropertiesGroup" to property of type "IconPropertiesGroup_QMLTYPE_101*" as the former is neither the same as the lat
There have been fixes for similar bugs.