Hey, I recently switched from a 1070ti to a 6700xt and noticed this same issue with video RGB range. However, after updating to the newest driver (23.5.1), the video RGB range looks correct now. I haven't tested this with 10-bit pixel format enabled yet, but the video RGB range seems to be fixed with default settings (10-bit pixel format disabled/dithering enabled, default video profile) regardless if it is RGB or YCbCr 4:4:4.
I haven't noticed the deinterlacing issue you're referring to, but DVDs seem to be playing in 24p with proper pacing with this driver.
If you still own an AMD gpu and are still having these issues, I would highly recommend trying out this driver and testing it to see if it fixed these issues for you. Let me know if it does or does not fix the issues.