Having multiple images selected from the filmstrip, when you select a rotate direction, only the image you selected is rotated. It would make workflow faster if all images selected are rotated. I also miss the quick rotate buttons from Lightroom Classic.
This is as-designed behavior. Edit sliders only work on the image in the Loupe view - other selected images are ignored to prevent your editing images you did not intend to edit which may be selected but not visible in the film strip. You can submit a feature request if you like but this has been standard for all versions of Lightroom for 14 years.