Battery Voltage is halved when using ESC Telemetry

Hey there,
My Pixhawk 6x, FW 1.14.3dev shows only half of the voltage when using ESC as battery source.

In the ESC_Info message the correct Voltage appears, but in the battery message exactly half of the voltage is shown.
I use two APD ESCs but only one is connected via DShot Telemetry.

Any Ideas where Pixhawk divides the voltage?