An SB-800 mounted on the camera in the usual way fails the same way as the in-camera flash. When I put the SB-800 itself into master mode, with CLS setting entered on the SB-800 screen, it is able to command the SB-R200.
A firmware update with CLS fixes is rumored. I think I'll wait a little for it. Normally I don't act based on Nikon rumors, but I think I have a workaround with the SB-800 master mode. I had never used that mode before. I didn't need to with older cameras.