Wrong focus of voice output in ListView with vertical scrollbar

A DESCRIPTION OF THE PROBLEM :
While navigation through the elements of ListView with vertical scrollbar, voice output (Narrator) loses focus.

We provide a testcase and a video here:
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STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
ListView.jar starten
Narrator starten -> "Item 1. 1 von 12"
'Pfeil unten'-Taste -> "Item 2. 2 von 12"
'Pfeil unten'-Taste -> "Item 3. 3 von 12"
'Pfeil unten'-Taste -> "Item 4. 4 von 12"
'Pfeil unten'-Taste -> "Item 5. 5 von 12"
'Pfeil unten'-Taste -> "Item 6. 0 von 12"
'Pfeil unten'-Taste -> "Item 7. 0 von 12"


FREQUENCY : always