Double travel time when adding waypoint (AZ)

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The route finding algorithm goes crazy when I add a single way point.
Repro: Route from PHX to Grand Canyon is 3:30
https://abetterrouteplanner.com/?plan_uuid=56d4a6b0-20e9-46f5-903f-9dd61160884c

Add Sedona SC and the trip goes all weird and is 6 hours. Other permutations are similar.
https://abetterrouteplanner.com/?plan_uuid=2ef2e41a-304a-457d-9c68-e7451156d291