Widget UI Resize

Hi all,
How can I align widgets with AlignOnce enabled manually in resize handler?
(Actually even with AlignOnce disabled it doesn’t update the position)

does the parent have a size? is it an empty node?

It seems it happened because the parent node has a size but doesn’t have a widget. If I add a widget on parent everything works. I wonder how effective works the align once disabled state? Does it align only on resize or in update?