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this one was a little tricky... I couldn´t get your project running, so I created a new one to show the problem.
The problem occurs when the size of the scheduler control changes, e.g. with a label under the scheduler control which changes it´s size due to text change.
With UWP everything stays fine, with Android the scheduler control fires VisibleDatesChanged and the selection is lost.
I can find a workaround for this, but the control should behave in the same way under all OS I think.