Sign text in the sign edit UI is no longer updated in real time

Summary

The text written in the sign edit UI would not update in real time with the sign (or hanging sign) in the world.

Steps to reproduce

1. Place a sign of any kind in a position that will be visible when the sign edit UI appears.
2. Type any characters in the sign edit UI.

Expected Result

The sign in the background / world would update as the player type text into the sign edit UI.

Observed Result

The sign in the background / world would not update as the player type text into the sign edit UI.

Note

The sign would update once the player closes the sign edit UI, and the text on the sign would appear as intended.