Icon beside build in AppStore Connect missing

I have uploaded Catalyst builds of my iPad apps, and ASC finds the app icons in the bundles, but the little icons that appear beside builds in the build listing do not display.

I have turned on mac icons in the attributes pane of Assets.xassets and filled all the Mac wells correctly.

ASC let me submit the apps for review, so is there a problem, or is this an ASC issue?