TAB key may not select all window elements (μTorrent 2.2.1 example)

ReactOS 0.4.12-dev (Build 20181231-0.4.12-dev-252-ga179012)

Pressing repeatedly TAB key does not iterate over all window elements.
In ReactOS & Wine only links are selected while Windows focuses buttons and checkboxes too.
This issue may apply system-wide to other 3rd party applications however I noticed it first in μTorrent 2.2.1 (25302). Did not notice that using ROS apps.
Pressing buttons and checkboxes using mouse (button down only+move) selects them but they still can't be selected after TAB meets first/upper window element.