Seems like folks on Reddit are reporting similar issues since the redesign:
https://www.reddit.com/r/USCIS/comments/mnk810/we_have_mailed_a_request_for_evidence_to_you_this/
The consensus there seems to be that this is a bug and that they are not expecting to see anything.
On my end, I contacted someone via USCIS Live Chat (http://ceciva.uscis.gov/Alme) and they said that a Tier 2 person will call me back within two weeks.
Yay. Waiting game.