LSL6 music plays all instruments / tracks at once

[RayKoopa]

• ScummVM 2.6.0git5915-gf29cdfcf46a (May 22 2022 09:53:09)
• Game language: English
• Game version: Hi-Res 1.000.000
• Windows 11 21H2 10.0.22000.675

Steps to reproduce:

• Start a new game.
• Leave the hotel and enter the beach (either to the right of the pool, or to the top of the exterior bridge).
• Wait for song to play the flute.
• All flute tracks will start at once in the first run-through of the song. Then the second repeating part of the song plays normally. Sample comparison (AdLib) ​ScummVM <=> ​DOSBox

Additional info:

• Music emulation does not matter (I reproduced it on AdLib, Midi, and MT32).
• IIRC, this bug occured since SVGA support was added, I just switched to DOSBox back then to get around it, thinking I've set up something wrong.

​Additional info from forum member Praetorian:

• Also happens in original Lo-res version.
• Beach music seemingly does not play at all when entering from the bridge.