I think we need to stop taking everything that
@WealeyH @Dutch and
@Llewelynf say as complete confirmation that something has or hasn't been done. I believe that they mentioned there were other beta testers working on other aspects of the game (or at the very least other beta testers). There may well be things that they aren't aware of or not at liberty to say.
What I'd just add here is to make the distinction of what the goal of the beta team is - they aren't testers in a bug tracking sense - that's at Big Ant's end and it's not something we could expect of them to be taking on as a task. They're involved to play the game and give feedback on how it plays, what the problems are, what needs fixing, etc.
So in other words, the focus of theirs on gameplay is not because the patch process is exclusively focused on gameplay, but because the focus of the beta group process largely is.
I will however mention that no, at this stage we've been unable to track down the underlying cause of that career mode skills issue, but work is still ongoing in to trying to find that out and resolve it.