After updating to the optimized version HDR isn't working anymore. Can confirm on Reddit there are others who are having the same issue.

https://www.reddit.com/r/greedfall/comments/oaxq1q/hdr_and_series_x/

Hey there @f1r3h4wk3, thanks for the report! We're aware of this issue and are currently investigating.

I got a small 250mb update just there but HDR hasn't been fixed with it still.