Can't submit new version for review - "Missing Required Information"

I’ve got the same issue

“Missing Required Information: You are missing some required information. Please go back to Local Test and fill the fields in Version Details marked with *.”

All fields in Version Details marked with * are filled in.
Even fields without * are filled in.
Summary and Viewer Summary are well under the 140 character max
The Description field is well under the 1040 character max
General Category is filled.
There are no more than 15 categories entered.
Even the EULA and Privacy Policy URLs are filled in (tried both with and without)
Also re-uploaded all images and saved all changes multiple times in both sections.

Beyond the Version Details tab, all the fields in all other tabs are filled appropriately.
Even re-uploaded the assets files.
Moved to hosted and tested. The extension works fine.

Nonetheless, “Submit for Review” results in the “Missing Required Information” error.

I imagine there’s a quirky detail somewhere I’m overlooking.