I’ve found that the preview settings (on default right) works much better if it’s set to match the viewport settings. It’s almost as if you can fully see preRendered viewport frames in the green just fine if you scrub viewport, but once you hit Preview? (if they’re not matched full, half, quarter, etc) The preview will have to reRender all those frames again at the preview resolution. Does that make sense ?🤣 Just a thought. It’s helped me