FWIW when I did my R-ATP at FlightSafety a while back, I needed 23 sim hours to count toward my multi time requirement.
The training center had not seen a R-ATP before and needed some guidance from the FSDO.
The Feds told us to log it as Total Time, AMEL, and Sim. Because I was using that time to meet the time-in-class requirement, that time in class had to be logged accordingly.
Since then (recurrent) I've just not logged the sim time at all - I use the 8410 or my FSI completion certs to show my currency. Not sure if that's the right or wrong attitude, but meh.