Apple Confirms FaceTime Bug

https://www.cnet.com/google-amp/news/apple-facetime-bug-lets-you-hear-iphone-mac-audio-before-the-call-is-connected

Update: Apple has disabled FaceTime Groups on its end, listing Group Facetime as “temporarily unavailable” on its support page. This serves as a temporary fix until Apple officially gives the all clear that the bug has been fixed.