I updated Photolab today - now using version 3.3.0 build 54. On exporting DNG back to Lightroom all I get is washed out image of pinks and yellows; no blues, greens etc. Ni issue with exporting Tiffs.
I’ve just got an update to version 3.3.1. The releasenotes mention a fix for wrong colorspace in dng files. Haven’t tested it yet but sounds like it could solve your problem.
This is also in 3.3.2 it does not happen on all images I wonder when exactly occurs as I can’t reproduce it systematically