Bluetooth doesn't work if a sim card is inserted

[stanwood]

I just tried to pair my Redmi Note 7 to my car BT system, but as soon as I type the Sim Pin code, Bluetooth disappears.

Even if I reactivate Bluetooth, the bt icon stays disabled.
If I activate BT in settings, it still says that BT is NOT discoverable.

I also tried to type bluetoothctl in the terminal, it returns me:

[bluetooth]# nnect to bluetoothd...

and runs endless..

If no Sim is inserted Bluetooth works... (weird)

I've already tried to reinstall UT via Installer, no change.

Is there any workaround?

Thank you beforehand!