Not sure if this helps but this was in the documentation.
SAMPLING MODE
Enables motion blur and depth of field, and sets pixel filtering modes, from the options below:
Distributed Rays:
Option to show distributed ray tracing, i.e., if enabled, motion blur and DOF are sampled. This is enabled by ...

just to help others out that have this problem. we have this problem but if we render with AOV and have save beauty checked we get a userpass that is the beauty that is gamma correct.