ICM-20948 accelerometer 4.5kHz FIFO

Has anyone been able to sample the ICM-20948 accelerometer at the maximum rate of 4.5kHz via the FIFO?
I cannot get it to go over 1125Hz, even after confirming all of the settings.
In particular, ACCEL_FCHOICE=0, ACCEL_CYCLE=0
I'm confirming the rate by the actual flow out of the FIFO, and am confirming that the FIFO is not overflowing.