Bosch - GSB 18V-50 - is this normal?

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Hello.
I just bought an Bosch GSB 18V - 50 (product code: 06019H5100).
I noticed that when I tighten the keyless chuck there is at first some small movement of the motor - you can hear the motor spinning - even with the rotational direction switch in "locked" position . After the first click everything is O.K. - no movement and motor sound heared.

Is this normal?

The reason i am asking this is I have a GSB 16 RE and on this one the chuck stay firmly locked when I tighten the bits - no movement  of the chuck with the motor.

This post was edited by chris99 on 16.12.2021, 06:17 o’clock
Reason: title edit