Audio bug with nested timelines

I did the audio on a shortfilm and its edited in 5 timelines and combined in one “master” timeline with all five compounded/nested timelines.

The error is volume changes, some processing on some clips are turned of. Mixed audio is not smooth sounding with not so smooth fades. Like less finess.

When playing back the master timeline i get some “eco lag” which is not present in each timeline. I never use compounded timelines normally (bad experience from premiere), but I thought I try it this time. Each timeline have around 15 layers of audio with processing on. But all tracks are not occupied at the same time at all time of course.

Is this a common problem?

Tomorrow I will render out each timeline separately and switch out the compounded timlines. Hopefully, everything will be good after that. Perhaps there is a render and replace feature that is better to use. But it would be nice if it had worked as supposed. The grade is not yet applied to any of the clips.

There are many threads about problems with audio on nested timelines since 17 beta started.

I did a simple test to prove that the audio output of nested timelines is not 100% identical compared to decomposed timelines.

I rendered the audio of a 6.5 hour long video by using a nested timeline, I rendered another one but this time I decomposed the nested timeline. Here is the waveforms of the nested and the decomposed timeline.

NestedDecomposed.png (20.18 KiB) Viewed 407 times

I imported the two audio files in Reaper and inverted the phase of the second one to cancel each other out.
If the rendered audio files of the nested and the decomposed timelines were 100% identical, the result file should be completely silent.

Here is the result and it's not silent at all, half of the audio is problematic.

Result.png (14.39 KiB) Viewed 407 times

Thanks, Its some akward things happening for sure. Hopefully everything works as should in the timelines, so I can export them individually instead.