Audio sometimes does not play, suspecting after an immediate TP

Verification builds: 1.6.0.0 - RC0, Beta 15 (980905)

Summary: Audio via the /playsound command sometimes does not work, this causes sound not to play in Dr Splice's Lab Escape when entering the Forest Zone.  We suspect this may be a race condition as we stop sounds, teleport the player and then play the sound.  Each command works when executed manually/individually.

Impact: The sound doesn't play, although the chat text accompanying the voice over does appear.

Repro Steps:

1. Command: stop sounds
2. Command: Teleport all players to an area
3. Command: Set game mode to adventure
4. Command: Output some chat text using /say
5. Command: Play the sound

Observed Results: All the commands work, but the sound does not play.

Expected Results: The sound should play.

Screenshots/Videos attached: No.