A350-900 Flaps 1 Retraction no sound

Was departing an airport, and as I was retracting flaps, from 1 to 0 there is no flaps sound in the cockpit. I know that flaps 1 is only slats, so I’m not sure if this is a bug? I did not notice this before 20.1. There is sound for all other flap positions.

this is something I noticed in 19.4

Also before the new Release of 20.1 the Slats didn‘t do any sounds. But I think the Slats in general don‘t give out any sound when retraced or set.

Known issue and in the tracker. Thank you!