Missing audio in exported H264 file for timeline with multiple GoPro Hero 9 video and audio tracks

[iainh36844551]

When I export footage from the timeline that has multiple GoPro Hero 9 4K video files recorded in H265 on the Hero 9, the exported file has missing audio in some places. 

If you do anther export using the same export settings, the audio re-appears in places where it was missing but disappears on places where the audio was in the original export. 

I'm exporting to H264 and H265 file formats. 

The issue only occurs where there are multiple video/audio clips. 

This happens in version 15.1 and v15.4.

I've tried exporting to ACC and MPEG but it makes no difference. 

I've also done the folowing:

Re-imported the GoPro clips.

Cleared the data cache and cache database.

Unlinked the audio tracks on the timeline.

Rendered the footage.

Re-installed Premiere pro.

Same issue occurs. 

Reverted to version 14.7 and v14.9 and the exported file works fine with no missing audio. 

So, looks a bug in version 15.x 

Anyone else had this issue and been able to find a work around?

[MyerPj]

Simon has a good way also, open a new project and import in the 'new version' project. Otherwise, if you have a google drive or such, you can put the project file (.prproj) on there and send me a link and I'll give it a try.