Text on signs cannot be seen by other players whilst the sign GUI is open

The Bug:

When a player writes something on a sign without exiting the GUI, the sign block itself reflects the text for the person who's editing the sign, but not for other players.

Steps to Reproduce:

• Get two players and label them "Player A" and "Player B".

• Get "Player A" to place down a sign, write some text on it, and not exit the sign GUI.

• Get "Player B" to look at the sign "Player A" is writing some text on.

• Take note as to whether or not text on signs can be seen by other players whilst the sign GUI is open.

Observed Behavior:

Text on signs cannot be seen by other players whilst the sign GUI is open.

Expected Behavior:

Text on signs would be visible by all players regardless of whether or not the sign GUI is open.