The buttpack's direct access to chemlight and radio was apparently removed with the latest patch. If this was done intentionally (e.g. simulating, that you can only access these remote positions when unequipping the buttpack) it is okay - if chemlights are not equipped to the chemlight slot automatically upon pickup! Otherwise it is a nuisance when you always have to remove the compromising chemlight manually. Suggested solution: either restore the old buttpack UI or disable the chemlight auto-assignement for buttpacks