I also have 12 different cameras in my scene.
I want to render every cache separately through all 12 cameras- 72 rops in total.
I'm creating a new cam attribute wedge after the geo caches and plugin this to rop fetch.
I'm referencing this new cam_seed attribute into the mantra camera parameter.
This new wedge node generate proper number of work items- 72 in this case but after the first 6 items, my geo caches disappeared.