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So, after re-checking:

If I copy cam_mul to pre_mul BEFORE unpack(), I get the same picture (picture1) as if I copy cam_mul to user_mul.

If I copy cam_mul to pre_mul AFTER unpack(), I get picture2, different from the first one. However, copying cam_mul to user_mul after unpack() still produces picture1.
That may be simply because the right way to do is to set user_mul, not pre_mul... ;)

What worries me is that if I use_camera_wb=1, and do not touch user_mul nor pre_mul, I get picture3 (different from picture1). I was expecting to get picture1...