Rooms with carpet on the floor cannot have maps in item frames placed on walls touching the floor

(Apologies if this is a duplicate, but nothing came up when I searched Done Issues)

Rooms with carpet on the floor cannot have maps in item frames placed on walls touching the floor.

This appears to have been introduced with https://bugs.mojang.com/browse/MC/issues/MC-36783, which I believe was reverted after its initial implementation in 22w15a due to this behavior, only to be reimplemented in 25w34a, which is why it is in 1.21.9 RC1.