/title command not working

Within the game both singleplayer and multiplayer i was testing certain commands

and came across a issue with /title in that the following command

/title @a title {"text":"Hi","color":"gold","bold":true} didn't work,removing and adding certain variables such as "bold":true,"italic":true and "underlined":true had no effect on making the command work.

Other subcommands such as /title @a subtitle or /title @a actionbar are also broken

How to reproduce
1.Open any minecraft world/join a server where you're opped
2.Type in any /title command with its sytax correct. Eg command. "/title @a title {"text":"hi","color":"gold}

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