I've used many brands of adaptive cruise control with lane centering and none of them are absolutely trustworthy. I don't see why anyone would expect Tesla's adaptive cruise control with lane centering to be any different. Especially considering they called it "autopilot", a term which can refer to the performing of rote tasks without self-awareness.[0]

[0] https://www.macmillandictionary.com/dictionary/american/on-a...