Thank you for reporting this bug. We will make it our priority to review this report.
Center layout with incorrect positions
if I have a Vertical layout container that have scrolling active and than add many HBox layout container with a centered layout in it the layout of the centered layout was correct if it was in the displayed region. If I go to the bottom The inner component of the centered layout was positioned at the top of the Vertical layout container and not in the HBox layout container.
Would you be able to provide a small test case that implements EntryPoint? This will ensure that what you're describing and what we're testing are in fact the same test case.
I have made a small image for the layout. Next week I think I have time to code a example if you must have than one.
I hope the image help you also.