Hoping someone can help me to understand.

Have a file cache that is placed after 3x SOP import nodes, which bring in geometry with an RBD sim. I use a switch node to flip from the non-broken geo to the broken geo at point of impact.

I read that I need a file cache here because it is time dependent, so have set that up.

However, I save the USD file and then the viewport shows that the break happens prior to the correct frame.

On the switch node prior to the cache, everything is working great, so I don't understand why the output of the file cache node is different?