Indicator not updating value when viewPortFraction property is set (value near the half of Screen Width)

[Kop3sh]

GIVEN we are using the built-in CarouselController() to manage the current index indicator as mentioned in the docs and the viewPortFraction property is set to a value near 0.6 (maybe set close to the half screen width)
WHEN the user slides to the next slide,
THEN the indicator does not reflect the changes. (Error)

Expected Behavior: indicator changes accordingly

[PhuCG]

I have the same issues