Originally Posted by blenky
Interesting. I think it was me with the version with one m2ts file. However I have a rip of Aliens that has 26 m2ts files to cater for theatrical and DC version. Before the update the 'joins' were very noticeable. Using Bdinfo I located timestamps of the branches and tested. It went between them without issue.
I don't have that movie to try, but there is more to seamless branching than the audio issue at the m2ts file boundaries. I have other titles which I can use to verify if the audio issue is fixed. e.g Thor Ragnarok HD Blu-ray. Will let you know if the audio issue is resolved.
There is also the issue of playlist obfuscation, where a playlist is hidden (e.g. Venom, the spiderverse trailer). The Z9S doesn't handle that correctly.
Incredibles 2 Region B HD Blu-ray plays the same way from the media, the Dune Pro 4K and the Oppo 203, so it's possible to see how it should play.
Comparing the playback from the Z9S, there are glitches playing this movie. The language selection screen prior to the menu should display over a static background display. It displays over a black screen. The language selection text remains on the display after it should have cleared. There is a very short first chapter which is randomly omitted.
One tip, try clearing the system data (unless you have issues doing this), it cured the main issue with Venom UHD Blu-ray, that was the first time I'd seen it play on the Z9S without skipping the spaceship crash chapter.
But it still skips the Spiderverse trailer.
Thankfully I no longer have to wait for the firmware 'lottery' result.