Banding on export (10bit footage, 32bpc effects)
Exporting to a 10bit format such as ProRes 4:2:2 or CineForm causes severe banding on smooth gradients. Exporting a project shot with a Sony FS7 (XAVC 10bit) and using 32bpc effects causes severe banding on export regardless of the settings to a 10-bit codec (Software rendering, Max quality/bit depth 16bpc etc)
All effects are 32bpc and banding does not occur in the Program/Preview monitor in Premiere Pro. Re-importing the export shows serve banding and degradation on gradients when compared to the original before export. As others have mentioned, something is wrong with the Render engine in Premiere Pro.