Hello,
the detector footprint masks are numbered from 1 to 6 in the S2 L2A product from Theia. This makes it difficult to know which detector it actually is.
In the standard product all detectors are available. The actually used detectors have valid areas. This makes it easier to work with. Even though the not used detector masks can be omitted.
In addition, the detector footprint bands have also a little issue. The values are scaled like reflectance bands. This is not necessary. They should only contain values between 1 and 12, and not between 0.0001 and 0.0012.
For the standard product:
For a Theia product