You can't use any of the accented characters like à/è/ò in the game chat.
Probably only a Mac-version bug, but in the older version I've never had this problem.
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Note: this is a automatic message, so apologies if I miss something.
Cannot confirm on Windows. They're blocky but they still show up, see attached screenshot.