Apple has released the seventh developer beta of iOS 12. the latest beta brings along many bugfixes and some new issues, but the most significant change is the removal of Group FaceTime feature from iOS 12 Beta releases.
The release notes for iOS 12 Beta 7 mention the following as one of the new issues in iOS 12 development.
Group FaceTime has been removed from the initial release of iOS 12 and will ship in a future software update later this fall.
For the unaware, Group FaceTime was a new feature introduced in iOS 12 which allowed users to make FaceTime calls with up to 32 people simultaneously.
Although removed from the beta release, Group FaceTime will return with the public release of iOS 12 for everyone.