Screenshots don't appear in Flathub

I recently submitted my new Chess Clock app to Flathub, but the screenshots aren’t appearing on either the website or in Gnome Software. Strangely, they do appear in Software if I build the same Flatpak manifest locally with flatpak-builder and install it. I really can’t see what’s wrong with either the .appdata.xml file or the manifest that would make the screenshots not valid. Might someone more experienced with Flatpak and AppStream have any suggestions of how to fix this?

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there is an ongoing outage with the caching of screenshots. It’s is being worked on.