But where did you (or rather dt) get that value for the white level?
16383 == 2^14 - 1, so the largest integer value that can be stored in 14 bits. As it is an integer field, in principle all values are valid. It looks to me when dt cannot read a value from the image metadata, it silently uses the maximum possible value for the bit depth of the raw…
And yes, if it happens, it happens for all images from that camera body. I use a Sony, and it has the same issue (solution: auto-applied preset…).
Like I said, in the particular image from this thread, it doesn’t matter, as all pixels are below the lower of the two values. If it does happen (in other images) an indication is a magenta zone that’s not recognised as clipped (and doesn’t react to the highlight reconstruction module)