In part two of the game, when you are in the air vent passage, if you go TO THE LEFT (not the air vent that is in the center), you will arrive to the train room. Bud Tucker will appear opening the air vent that is on tle floor to get to this room. You will hear the sound of opening the air vent, OK. Now if you get back from the same air vent, the sound of closing it, will not get played, you will hear a very short sound, like a "click". I have checked this is in Dosbox, and the closing air vent sound is played. Also, i have checked this bug in several ScummVM versions, looks like this bug was never discovered and it is not a regression bug.
SAVEGAMES ATTACHED from ScummVM and Dosbox.
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ScummVM savegame to reproduce the error
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Dosbox savegame to see the correct behaviour (closing air vent sound is played)