Currently the only way to get the item inside an item frame is with query(e, 'nbt', 'Item'), which is quite computationally expensive.
Making the query work with item frames would be consistent with the behavior on item entities.

it is called getHeldItemStack() for itemframes iirc.

https://github.com/gnembon/fabric-carpet/blob/master/src/main/java/carpet/script/value/EntityValue.java#L505

u can change it by your self.... but i dont think it is very necessary. there are too many thing that is not exposed directly.
cannot see why that is special.

Related to #1364

This was resolved by #1364.