Here’s the response I got from support on the Strava vs Garmin importation issue:
If you’re pushing structured intervals to your head unit, I would say for now the best thing to do would be to disconnect Strava, as you had mentioned (although, you can also re-link it and configure it to only send TR workouts to Strava, and not vice-versa, if you still wanted a log of your training there).
While clicking on these workouts shows us 'Imported from Strava and Garmin Connect ', because they’re named ‘Evening Ride’/etc. (rather than ‘Acho +2’, for instance), I would agree that Strava may be throwing things off here.
So it seems to be simply a naming issue… I would hope that will get fixed. Strava does keep the lap/workout structure and that’s imported by TR so you would have thought that TR could simply look at the lap structure, and if it matches the outside workout structure then that should be enough.