I have encountered this bug multiple times now.
"Render frame range" is buggy.
Octane will not read in the geometry data if the data only start appear in the middle of the sequence.
For example, I have a geo object named "A" which only has polygon from Frame10 onward.
If I "save render as frame range " from Frame1 to Frame20, because "A" has nothing on the starting frame, Octane will be bugged and render the whole sequence without A.
But if I "save render as frame range " from Frame10 to Frame20, because "A" has geometry data on the starting frame, A will be rendered correctly and apear throughout the whole sequence.