Big problem with Pr 2023 and 8K .R3D
Premiere Pro has never dealt with 8K .R3Ds very well in my experience but this is a major problem. Projects that have effects applied (noise, ehco, posterize time etc.) to a clip that has Scale to Frame Size selected renders some kind of pink mask. See attached. The workaround is to deselect Scale to Frame Size and scale manually. Way to much extra work in large projects.
This does not happen in Premiere 2022.
This is my first time posting so let me know what other info you need.
Marc

