I've just QT'd your post. It's supported fine. 
I feel like it's worth mentioning, re; quote-boosts/QTs, that we can't "just add the feature to Mastodon" in a federation - it's a lot more complic...
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Some software hides the list of people you tagged.. so yea maybe you were tagged and it just wanst shown. Friendica does that.
@freemo @Ash I was notified even though I wasn't tagged, so I guess the software awoo.fyi is running has accounted for that! :)