Welcome to the forum, @
saltyoei
This is indeed a lazy response from QR. The whole point of the policy (that they promoted!) is that baggage will be interlined across separate tickets as long as the minimum connection time is met. Just to make sure they can't use this as a getout clause, what was the time between your flights at KUL?
Good to know MH are interlining across separate PNRs without telling you off!