Nested artboards - Export issues

I've created a Main artboard and nested 3 other artboards into it to achieve some sort of scene switching. I noticed several issues with that workflow:

- the loops are not playing at all - had to switch to "One shot" animation
- the animations are not as smooth as the original, there's a lot of twitching - had to turn mix down to 80%
- suddenly, some animations are not working at all or just partially working

What am I missing?

Here's the link to the REV file:
https://u.pcloud.link/publink/show?code=XZt7K45ZE72J4dgL6w4dqGQthKHPRmY7MU6k

MacOS Ventura, Desktop App