Thanks, looks like the distinguishing factor there is use of {{mld|en=}} instead of {{en}}. That's presumably just another HTML pattern that could be fed into CommonsMetadata and/or Mediaviewer at some point, the same way it does for {{en}} already. Alternatively, when this is worked on, we could also consider changing those templates themselves to be aligned and/or easier to work with.

Long-term we could also collaborate with the community to see if there is interest in unifying the two as there doesn't appear to be any notable difference or benefit to one over the other.

There wasn't much interest, see the Commons talk page link in the first comment. Granted we did not put much effort into prodding people.

This is easy to fix in CommonsMetadata, but it would be much nicer if it worked on the bases if a formally documented standard, instead of just reverse engineering templates as they exist right now. Most of the scraping it does is based on COM:MRD so if other communities (or other wikifatrms, possibly) want to create compatible templates, or others want to create compatible clients, they know where to look.