@Andy_Astbury1 can you please contribute one affected sample (a tiny one please, 12MPix or less) to https://raw.pixls.us/ please?
I agree with that @kmilos said here & in Darktable and Topaz Photo AI DNG incompatibility,
that metadata does look non-sensical, but there is an argument to be made
that [DNG] tiles can have padding rows/cols, and while it may seem, err, non-conventional,
to have a single tile with size much larger than the actual image size, that isn’t exactly illegal.