It's not a bug, but I will post it here. The 109E4 still has the short span slats that the F, G, and K have. It should start about 8 inches or so [EDIT: 1 foot?] past the 20mm barrel and continue all the way to the wing tip. I figured in the old model it would have been changed whenever they were updated. They were updated, but still has shorter slats.