When using the watchlist API module on a wiki that uses Wikidata (like enwiki), edits from Wikidata show up with no comment or any additional information.

At least the comment field should describe what the change is about.
Ideally, there should be some way to get additional information about the specific Wikidata change. (This information is stored in rc_params, but it doesn't seem to be accessible though the API.)

Similar issue is with the recentchanges module, though in that case, there is at least some indication that the edit comes from Wikidata (type=external).