If I export band B8A via ‘export view as image’ - full scene, full resolution, the result is a 5490x5490 pixel image, correct geolocation at top left corner, but with the resolution set to 10,-10 m (not 20, -20)
Workaround is possible - use the ‘listgeo’ program to extract the geo information from saved band 8a and band 8.
Edit the 8a information (with a text editor):
- ModelTransformationTag to 20 and -20
- Copy over the corner co-ordinates from band 8
Use ‘geotifcp -g’ to install the corrected information in a copy of the 8a geotiff file.