There’s a number of different forum topics all somehow related to this issue, the most general one probably being here, so it’s hard to choose which one to continue with, but…
I have just come across the most egregious example of this issue causing colour inaccuracies I have seen in my own photos to date. On the right: PhotoLab 8.1’s preview. On the left: the same PhotoLab’s exported image.
I have submitted a support ticket (in the “I have a software issue” category, as I did not find a bug report option) along with the raw file. I hope this helps them address the problem.