Bisected to commit 253430ab76348d99c81e3b753b6a32817bdb6666 as the start of the problem. Changed Focus Manager back to recursively calcing subobjects.
Whatever the reason is for this is, its wrong. we have to call _next here, as otherwise we dont explore the full tree but skip most of the nodes in the tree.
Also, how is this supposed to change anything in regards of placing and rendering ?