The EXIF image orientation value being stored for panoramas created by OpenCamera is "0", which is invalid. The correct value is generally "1". There is a nice reference for all values here: https://sirv.com/help/articles/rotate-photos-to-be-upright/
The good news, the software I've been using so far ignores the invalid value, sometimes generating a warning but continuing to work correctly.
$ exiv2 -Pgnv pr *PANO.jpeg | grep Orie
IMG_20220419_101204_PANO.jpeg Image Orientation 0
IMG_20220419_122207_PANO.jpeg Image Orientation 0
IMG_20220419_130020_PANO.jpeg Image Orientation 0
OpenCamera is writing standard, non-panorama images with the correct orientation values.
Thank you.
Anonymous
This was reported before: https://sourceforge.net/p/opencamera/tickets/613/
Some software does not work with wrong orientation (e.g. img2pdf).