Using the mosaic operator with –SsourceProducts is just the wrong way of invoking this operator.
If you look at the help when calling gpt Mosaic -h. You see that there is no sourceProducts option.
The
–SsourceProducts-parameter is ignored and the others are treated as in the corrected call.
Keeping the band properties or let the user specify those properties for the variables is definitely missing. I’ve noted this (SNAP-745).