Although you mentioned that you had reset all bars in Bar Settings, the one thing that comes to mind is to select the bar where the issue begins, press function key <F5> (or right-click and select Bar Settings) and check if any of the tracks are still muted (volume change etc) at that point.

Are the tracks frozen?

On the chord sheet, are there any red marks on that specific bar(s) indicating a bar change is still in place?

If you view the MIDI data for those bars, what are the velocity / volume values (the Piano Roll editor might be a good way to check this).

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