Incident where user in a group chat is being classed as not being in it

Hi everyone, I noticed a bug 2 days ago on June 5th of where a user in a DevForum DM is being classed by the message composer as not being in it, which is false.

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Reproduce:

Create a group DM on DevForum messages and then write a reply by tagging a member of the DM.

Thanks for everyone who gives out advice

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