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Version 17.1 is the only minor update to version 17.0 of Bloons TD 6. It consists of bug fixes, minor balance changes, and a new feature for the Jukebox.
Marine: Activating the ability when the Heli is about to redeploy a tower no longer causes it to keep spawning Marines in the same place every few seconds (bug fix)
This update changed how the background music is assigned to each map internally. Prior to this update, it was part of each map's Map object, which contains all map data loaded on the fly (paths, models, removables, etc). Starting in this update, it is part of each map's MapDetails object, which contains all map data loaded during game startup (text, difficulty, default co-op division, etc). The background music of some maps seemingly changed because the developers assigned different music when adding them to the MapDetails assets, though whether these changes were intended or not is unclear.