"Your game mode has been changed" message doesn't print new gamemode in gray and italic everywhere

See attached screenshot for what I mean. It only works this way in singleplayer and LAN games, but only for the host. It doesn't work at all on a server.

It always prints the whole line, but it is not cursive/grey everywhere. It should be cursive everywhere.

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Code analysis by Marcono1234 can be found in this comment.