I have a legacy MusicVket world that uses a unique synced timeline animator system
That system is shared in one other place with PK's for "The Core", in particular the LLLL world that was submitted to Venice Immersive.
In the most recent build I found I was unable to trigger the start, but users on live could.
It's a simple Interact() that triggers timeline.Play(); with other magic behind it.
The udon crashes and the trigger volume disappears.
This has worked since early 2021 without major issues, and I test it frequently to show newcomers.