Uploaded faked portrait (flower) with xmp files raw file and jpg to filebin
Realised a flower is not ideal for showing orientation 
but you have to take my word for it being in portrait format.
hmm… seeing that filebin shows the image correctly perhaps it’s a geeqie bug?
Edit:
Looking at the exif I find the following:
Perhaps only Geeqie reads the xmp.tiff.Orientation tag. The question is how they got out of sync.
Edit: Exiftool output
$ exiftool -Orientation -a IMGP8328.* ======== IMGP8328.DNG Orientation : Rotate 270 CW ======== IMGP8328.DNG.xmp Orientation : Rotate 270 CW ======== IMGP8328.DNG.xmp.digiKam Orientation : Rotate 270 CW ======== IMGP8328.jpg Orientation : Horizontal (normal) Orientation : Rotate 270 CW 4 image files read