DK64 Crystal Caves Banana Not Awarding on Emulator

How do you get the banana in the cabin with the Diddy pad where you shoot the enemies dead? I clear the room and it keeps not counting it for some reason. I'm playing it on Mupen using Rosalie's GUI if that makes a difference or of there is something to trigger correctly or something. My most recent success was where I had 7 seconds to spare and the countdown dropped to 0, then the 10 second countdown began, and no banana. What gives?