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2019.8.5 3aaa23d installed today, and includes seamless Navigate on Autopilot
Whatever 2019.8.5 3aaa23d is, one of our two M3s received it this morning.
Updated to add that this update includes the new seamless Navigate on Autopilot that Tesla announced just yesterday. Here is a photo of the settings (our other M3 has 2019.8.3, and that dialog includes only the SPEED BASED LANE CHANGES setting):