After editing a workout that was previously downloaded to my Fenix 6 Pro the modified workout is not synced. I tried repeatedly "send to device" and got the message that the workout will be available after syncing, and then manually forced a sync. The workout on my watch doesn't change. The only way to get the new workout setting to the watch is to delete the 'old' workout from the watch, using the button interface. This can be especially annoying after a renaming a workout, if you aren't sure which is the workout you have to delete, since the names don't match anymore.
While it is possible to work around most of the problem by deleting the 'old' workout it's not how I would expect this to work. I'm a technically inclined user, I imagine this must be utterly confusing for others.