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NoA switch to AutoPilot

I have a general question regarding NOA switching to Autopilot mode when approaching a tunnel.
I believe NOA needs information using internet/satellite data this means, the car needs a solid connection.
In Switzerland you have a very good reception in tunnels (mostly LTE with 4-5 bars).
So may be it's a general behavior of NOA that there is no connection when driving through a tunnel so NOA changes automatically to Autopilot mode regardless of the available connection.