I have one muted person here.

This is the message that shows when muting someone

Muting this user will prevent their posts or comments from appearing to you, unless you visit the user's profile.

I click on mute and get the message - This member is already muted

But I still see posts/comments 🤷‍♂️

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Lilymoon · F

Mute means you won't see their annoying comments in your feed. It's a win win

Gusman · 61-69, M

@Lilymoon I still see the comments so it is not working as it should.
Worked for a while, then all comments became visible again.