This may just be me, but it seems that during ALL Heart of Thorns cut-scenes (haven’t experienced this in season 3), the dialogue goes progressively more and more out of sync the longer it goes on.
A big example of this is during ‘Prisoners of the Dragon’. I have posted a YouTube video showing this as an example here: https://www.youtube.com/watch?v=NO29N8W7Jes&feature=youtu.be
You can clearly see it happening at 2 minutes onwards.
This doesn’t appear to happen for sound effects of environmental objects or animal roars, just dialogue in my experience.