Is there any plans to add curios support for the backpack?

We tried adding the "curios:back" tag to the backpack which works fine however the backpack doesn't function when in that slot. The backpack only functions when in the chestplate armour slot (presumably as intended).

Image link of backpack in the curios slot

The client log is too large to upload to pastebin but if it is desperately needed then it can be sent.