Since yesterday's Final Fantasy update (3 June, v2025.49.0), the incorrect card sleeve is displayed for every deck in the deck builder screens. The default brown MTG sleeve is now displayed, not the default sleeve you have set in your profile, or the sleeve you have explicitly set for each deck. See attached screenshot for an example.

Note that the correct / custom sleeve is displayed on the battlefield, so this bug is only impacting the deck builder screens.

Also, selecting "Repair Game Files" does not resolve the issue.

UPDATE: this issue is affecting any deck that uses the same card sleeve that's selected as the default in your profile (i.e. the correct sleeve is only displayed for decks which have a sleeve selected that does not match the default that is selected in your profile).