QMatrix4x4 contains an internal Flag enum that is incorrectly documented as Flags. In the header file the flags are correctly defined using the Q_DECLARE_FLAGS(Flags, Flag) macro.

Perhaps because QDoc is confused about the documentation, it generates a "flags Flags" public type in the QMatrix4x4 documentation, but the link refers to a non-existent section. It warns about missing documentation for QMatrix4x4::Flags.

The documentation clearly needs to be fixed, but there is also an underlying issue with relationships between nodes with different access/visibility levels.