Yes, that is the expected outcome because the default value for RXAUTR is 0.
I’ve seen some remarks about RXAUTR but they seem circumscribed to the DW1000. Actually I haven’t experienced issues setting it with the DW3000.
The DW3000 Device Driver Version 04.00.00 has the function dwt_setdblrxbuffmode, I don’t know if that has been changed in newer versions.