JSON signs with scoreboard objectives don't auto update scores

unlike in 1.8, JSON signs with scores in them do not update whenever the score changes. This issue is being updated due to the fixing of MC-101457 to reconsider the issue of whether scores should autoupdate or not.

Steps to reproduce:

1. Create a new world
2. run the following commands:

/scoreboard objectives add hi dummy
/scoreboard players set @p hi 100

3. place a sign down
4. change the block data of the sign to the following:

{Text1:"[\"\",{\"text\":\"hi\"}]",Text2:"[\"\",{\"score\":{\"name\":\"@p\",\"objective\":\"hi\"}}]"}

5. run the following command:

/scoreboard players set @p hi 5

Notice how the sign's score stays at 100, instead of updating to 5. Doing the following steps in 1.8 you should see the sign automatically update to 5.