May potentially just be an issue with older imports, but items with 2 or more materials seem to have the metadata assigned to the wrong materials. Not sure when it started happening, but they did work fine during the original upload process. Doesn’t happen to all items, though.
Example 1: Material 2 metadata is being assigned to Material 3, and vice versa.
Example 2: Material 1 metadata is being assigned to Material 3, Material 3 metadata is being assigned to Material 2, and Material 2 metadata is being assigned to Material 1.