I haven’t tested it yet, but it seems the new iOS app automatically syncs the calendar. It did not bring over my calendar but it might mess up your workaround when you upload your workouts.
same problem here. This is annoying as heck.
I noticed that the training plans are coming over under my workouts. WTF.
It seems it was never fixed, and that a business decision was made to purposefully remove support for training plans and calendars across the Garmin product range. That's one way of dismantling your business.