REG [4.8.6-5.0.2] TouchBegin event triggered for each new touch

When Widget is set to ScrollArea it triggers QEvent::TouchBegin on every new finger touch. Expection is that only one TouchBegin triggers and after that TouchUpdates. Worked as expected on Qt 4.8.6.

Test attached example and see output log that there's begin event when touchpoint count is increased. If the idea is correct then begin event should also have correct count instead 1 as it is now.

begin 1
Update 1
begin 1
Update 2
begin 1
Update 4