In the first DNG from above, the white level is at 60375 (this DNG was promoted to 16-bit data). However, I cannot reproduce this behavior - white level on my camera, with the latest build, is at 16383 (for 14-bit data). ISO 100, 1/33, 3x crop, 1080p25.
Just in case - can you upload DNGs created with mlv_dump? The above DNGs were scaled by the converter.
I don't expect this issue because I didn't change the register configuration. The problem might be random and appearing on both builds - can you rule out this case?
To recover existing footage, reduce the white level in the DNGs with exiftool (for the above DNG, 60374 should do the trick).