Using RAW images from Nikon Z7 on iPad Pro 11 2021 with M1, after double tapping to zoom to (sometimes/usually) 100% zoom, the preview shown is fuzzy sometimes. It will fix itself and become crisp after any edit controls are changed (eg move exposure slide up and then hit undo).
Can be seen almost always by zooming in and then panning by moving one finger/pencil across the screen. Can be seen sometimes on first zoom in without any panning.
To be clear, this is 100% definitely with Originals stored locally (imported on iPad) and set to be stored locally.