Sticker not working in comments

When I posted a comment with a star guardian sticker (or emote) The comment posts as an empty comment. I reloaded but now the comment wasn't there. Is this a bug?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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