MoveFocusedUp/Down with Grouped columns

[hurnik-firstis]

Hey, I've been experiencing some problems with the focused table property, when I group the columns together.
It seems to be unable to locate the next rowkeyValue and gets stuck.

It's fairly difficult to explain but here's a tutorial how to get the mentioned error:
Group columns, try to move down/up until you reach an element that is last in the group and the next element is another group head cell.

That's pretty much all, expected behaviour should be the focus skipping onto the next item inside the next group.

Thank you!