Sign texture in backside editing UI is not accurate

Steps to Reproduce:

1. Place any sign or hanging sign;
2. Walk to the back of it and edit;
3. Compare the in world sign and the UI.

Observed Results:
The UI always displays the front of the sign, regardless of which side is being edited.

Expected Results:
The UI changes the texture displayed based on which side is being edited.

Screenshots/Videos attached: Yes

Notes: This is more noticeable with resource packs that change the sign texture to have more contrasting sides.