Colour renderings are intended to change colours and tonality of images. Depending on selected rendering and WCS, images change more or less. This is to be expected.
The issue I have with DPL6 is, that renderings use names as in DPL5, even though they render differently, and I hope that DxO wil come up with respective fixes and communications.
At the time being, we are confronted with new half-baked features in a paid release. Bugs happen, proposing half baked features is a deliberate choice and bad manners imo.