Banners held in off-hand show in an sign in first person view

The banner with offhand using /replaceitem command will displayed an sign in First person view.

Steps to reproduce

Take any banners to off-hand using command.

for example: /replaceitem entity @s slot.weapon.offhand 0 banner

Observed results
The banner appears a sign in first person with offhand.

Expected behavior
The banner should be same design of banner.