Testing out the latest AE Beta v22.214.171.124 on Windows and found that any export of ProRes 4444 (including XQ) has a color shift and small additional amount of grain.
I've tried CUDA vs. Software Only, 32 vs 16 bpc project, Millions vs Trillions of Colors, MFR vs No MFR - all exhibit the same issue. Note: AE 2021 on the same system renders the ProRes 4444 correctly.
To test the actual shift, I created a 50% gray solid composition in 32bit and rendered it out in multiple different formats:
ProRes 422, ProRes 4444, ProRes 4444 XQ, (and Tiff Sequence as a control)
When re-importing the renders, the 4444 and 4444 XQ renders exhibit the shift, as seen in the RGB values, for example:
Original grey solid:
ProRes 4444 Render:
Here's the ProRes 4444 on top of the original 50% gray with a Difference blending mode (comp viewer exposure is bumped up about +12). Played back, the grain pattern moves uniformly across the screen.
I've included all of the renders of the 50% gray and a video of the difference blend playing back at this link so you can take a look: