MSFS/Asobo AU (WU7) update problem m8. Well, just didn't get fixed up from the onset. (Don't think Orbx did anything on the western side of AU).
Tree overage is brutal all over the world and has been that way from the start. The sim indeed has a foliage problem, not even a few million lumberjacks can get the over-growth of trees under control!
On a serious note, go into General Options > Trees > change it to LOW. Reduces some quality but the bigger bang for the buck is that it also reduces quantity which is greatly needed.
nbrich1