Some of the 'multiverse legends' cards that gained new art in 'Machine have incorrectly applied the new Machine set symbol to the old cards in the collection. This makes it very confusing. Does not affect all of them, or maybe it only affects them once you own the new version. Compare Atris to Kenrith.

Atris should have the symbol for Theros Beyond Death.

Additionally it would just be great if those set symbols can be hovered, or there's a info popup (like for abilities) telling us which set the symbol belongs to.