Why don't you solve it...?So, you don’t know what the problem is, nor how to solve it but you estimate that it can be done in a week? Have you considered a career in Sales and Marketing.
All I am going off is the many number of bug fixes they resolve in major release betas e.g. iOS 11 or 12 con-current betas that are released weekly/fortnightly. PLUS they would have had even more devs working around the clock to get it sorted asap. I'm not actually sure how much code was put into the group FaceTime feature... Although someone did mention it could cause a regression so it's possible that's why they left it where it is at the moment so it works mostly.
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