fenix 6x pro sapphire, all current released software/firmware updates
garmin connect, iOS 4.47.2, was recently released
iOS15
iPhone 12 Pro Max
Power data graph for activities (either Wahoo Kickr Bike recorded to the watch or Zwift rides sent to Garmin Connect) no longer displays in the mobile Garmin Connect, including any power data in the nongraphic ride summary, but for time in power zones is still displayed. This appears to have happened in the past week, and affects all riding activities, including older rides. The Firstbeat metrics still get calculated from the activities recorded to the watch, and max and average power, etc are displayed on the watch for all activities. Everything displays normally on the Web version of Garmin Connect.
I had been using iOS15 betas and then iOS15 with normal display of the power data until then, and think this is related to the recent update for the mobile app.
I had stopped having the Zwift rides sent to Garmin Connect since the change to calculate training load for the non-device activities, as I always record rides on the watch to get Firstbeat metrics, and this results in double the training load each day, as considered two separate activities. I had talked to Garmin tech support 1-2 months ago, and they were aware of this problem. I only re-enabled transmission of Zwift rides yesterday to see if this has changed, has not, so deleted today's Zwift ride and disconnected from Zwift again. The lack of power graph and power metrics other than time in power zones was also in the Zwift ride that was transmitted to Garmin Connect, and the power graph problem was present before I tried reconnecting to Zwift.