Hi,
Yes, it should cache the root positions and save the data(by default) into the scene. Unless you use the option to store this data outside the scene. The button is not activated when you reload the scene?
It seems to be working fine here. I'm on C4D R23.110, Ox 2.1.2.26677 and Windows.
Please try to reproduce this in a clean scene with a sphere and attach it here.
Jeordanis Figuereo (Product Designer. EPHERE Inc.)