FWIW, I was in Austin and Houston the past few days and noticed several instances of similar “mis-behavior” of iOS Maps.
Specifically … while the on-map routing (i.e. the blue line) was always correctly displayed …
… the verbiage — and therefore the voice direction — did not always match reality.
Two notable examples:
Voice & Text direction was given to “Turn onto 183 North” — but the actual mapped route was to turn onto 183 Southbound.
Voice and Text direction to “Exit onto 130 toward Austin” — but the actual exit signage only presented two options: San Antonio or Waco.
As a consequence, one really needs to study the map prior to navigating interchanges; generally not a good practice for the driver.