Can you show an image of the output which depicts the missing parts?
There are some parameters in your graph which are not necessary, but not wrong neither.
In the first subset operator you can remove the sourceBands parameter, because you want to keep all bands.
Also the region parameter can be removed from all subset operators, because the data has been tailored by the first subset geoRegion.
I modified your graph a bit so that I can easier test it. And it worked for me. s2_preprocessing_copy.xml (6.8 KB)
I think its a matter of date not area, since i tried the same area on 11/1/2020, and it worked properly,the previous results were on 9/6/2020, but i need to try more dates to confirm it.
i don’t think so, i tried on several dates, on 5-30-2020,6-9-2020,7-14-2020 and the result of the preprocessing for the same area did have missing bands, while for dates 1-11-2020. and 5-20-2020 the result did include all the bands.