Auto throttle auto-on? - Aircraft & Systems - Microsoft Flight

So I have a need for speed. I’m flying the Cessna Longitude and the auto-throttle keeps coming on whenever I approach what the plane considers overspeed. I keep disconnecting it but it keeps coming on anyway. On the glass screen, it shows “Auto-throttle auto-on” right before auto-throttle re-engages. This did not happen in past flights. Is this a new feature? How to I turn auto-throttle off permanently?

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Auto throttle auto-on? - Aircraft & Systems - Microsoft Flight

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