Why does my Nextcloud tell me "Server version 30 or lower is required" for this app?

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Describe the bug
Despite the fact this is a Featured app, when I look at it within Nextcloud it says it's an untested app and that Server version 30 or lower is required. (and has a button to update to the version I'm already on 🤷 ) :

Whereas in the Nextcloud app store it says Highest Nextcloud version Nextcloud 31

To Reproduce
Steps to reproduce the behavior:

1. Go to /settings/apps/updates/deck and see it shows
2. Go to https://apps.nextcloud.com/apps/deck and see what it says there
3. Notice the discrepancy.

Expected behavior
I expect no discrepancies in such things.

Screenshots
as above

Start by comparing the compatibility information shown at /settings/apps/updates/deck with the Deck entry at https://apps.nextcloud.com/apps/deck, using the reported Nextcloud 30/31 discrepancy as the reproduction case. Done means the app interface and app store no longer show conflicting supported server versions; no source file or test is identified in the issue.