On the second bridge, you'll need to walk along the wall closely around the taller plants. 👍
I think there is a way to hear it from the first bridge in the wooden area but I wouldn't know. I've never played with headphones. 😅
Assuming this was in v1.00.3, did you do anything different the 3rd time? And for the second time did you restart the mission or did you restart the game?
When you say some of the pirates, was this all the pirates in one of the levels but none of the pirates in the others? Or was it only a few pirates in a level but the rest still worked?
As for the first question, I just go into the other places that still has some events that I haven't got yet then return to the Shrinking Cave to attempt to get the events.
For the second question, no I did the same with what I answered on the first question.
For the third question, yes it was only the pirates in one of the levels (The first level for the Pirates debut to be more specific)