When I collect a Triforce Piece in my Test Quest, the Midi plays as normal, but the last couple seconds get cut off by the exit Warp.
See the Demonstration Video for clarification.
[1330] Triforce Midi gets cut off by Warp.
There is already a thread like this.
Anyway, the music that gets cut off in that video is actually the the Triforce Cutscene music from the zelda.nsf file, which is treated as the default Triforce Cutscene Music. Without the zelda.nsf file, it would fall back to the built-in Triforce Cutscene MIDI, which does not appear to be cut off at all.
Whoops. Go me for not searching.
Should be fixed now.