Furthermore, a whole new third timeline is introduced that you can access in Append mode (where you have to complete the original game first, and then start NewGame + to get to the new content), or Perfect mode (where you can play the new content integrated from the start). (digitalchumps.com)
When Brice and Dixie finally meet in the past in a third timeline, instant attraction. (deanwesleysmith.com)
Tbh, I always thought the whole point of Hyrule Historia randomly throwing in a third timeline was Nintendo's signal that even they do not care all that much about continuity. (gonintendo.com)