IMAX accidentally releases the wrong 'The Mummy' movie trailer

An IMAX trailer for upcoming reboot The Mummy was uploaded with an unfinished sound mix, resulting in hilarity.
The trailer looked very similar to the first trailer Universal Pictures released, but sounded altogether different - not due to a baffling creative choice, but rather a genuine technical error.
It's unclear what happened, though the effect seems to be similar to the isolated vocal tracks that are used in music production.
The trailer's booming background audio and sound effects aren't present, leaving many weird silences punctuated by the actors' vocal tracks and a little ambient noise.