All functionality should be there, this is just about making sure the extension still works fine with current state of Wikibase "core".
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|Duplicate||None||T159235 Set up federated system of Wikibase instances on Beta Commons and Beta Wikidata|
|Resolved||Bawolff||T159709 Security review for WikibaseMediaInfo extension|
|Resolved||WMDE-leszek||T159239 Ensure all expected functionality of the baseline version of WikibaseMediaInfo extension works correctly|
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I've tested the extension locally and on structured-commons Labs instance and I've only discovered T163313. Apart from that the extensions seems to be working OK and doing what it is expected from the beta version.
T163313 is clearly something that should definitely be fixed before the extension is deployed to production but it does not block security review as far as I can tell.
Therefore this task is done.