Backlight does not work correctly during activity

1. Settings -> System -> Display -> During Activity -> Gesture -> On.

2. Press Start.

3. Select ''Run" and press Start.

4. Make gesture to turn on the screen by raising and turning your arm to look at your wrist.

5. Turn your wrist to the other side.

 

Expected result: Backlight turn off.

Actual result: Backlight doesn't turn off. Backlight remains on for the duration configured in the Settings -> System -> Display -> During Activity -> Timeout.

Forerunner 955, Software Version 19.18