In member lists, anonymous enums are displayed as simple links without names, as shown on https://doc-snapshots.qt.io/qt6-dev/qgraphicsobject-members.html

However, if the class containing the enum is in a different module, the representation is different, as shown on https://doc-snapshots.qt.io/qt6-dev/qgraphicssvgitem-members.html

The solution to this issue is to preserve the anonymous flag in index files.