Ya this is what I meant by this my comment above…I had initially looked at it purely from a WB point of view and so with all things being equal and using only defaults I was seeing the blue artifacts when the modern WB was used but not the legacy one. What I had not thought of was the role of HLR which is applied in both workflows by default as clip highlights. In the second video AP points out that HLR using the default to clip or LCH or color reconstruction really don’t work with CAT derived WB only with legacy. I think around 26 min. In fact as it turns out this is the source of those blue artifacts many are now seeing with filmic v6. I think now that we have a couple of new modes for HLR and the current LP method that can be combined with HLR in filmic as shown in those videos and those made by others this should be less of an issue.
If you use legacy WB and the default HLR you wont see this blue with filmic v6 at least for this image but I think many people are using modern WB and so should be using Filmic HLR with LPHLR if needed or the new segmentation and inpaint methods that seem to work well also…
If you disable all HLR which would have been the right comparison for the posters question then you can still visualize a difference between the two WB modes. Its is however not large and must be due to the chosen d65 coefficients and the CAT calculations (figure below). If you leave the image blown and don’t mess with exposure then the magenta is a little deeper with legacy WB (right side). And adding default filmic doesn’t convert these to blue confirming that indeed it is the combination of the clipping mode and WB mode that leads to this.
Given this I am not sure why when modern WB gets selected in preference that a different mode of HLR is now not the default. Perhaps with the newer less computationally intensive methods this will change.
In any case from all the recent discussions it is important for new users to be able to understand this interplay between all these elements along with the issues for some with incorrect raw whitepoint and questionable D65 coefficients as these can contribute and at times explain the artifacts that appear…
EDIT for completeness
Plus filmic with no HLR so as above but now just Filmic with Legacy on the right. Not the same wb but still basically both with correctable magenta highlights
Now adding default HLR (clip)… this is what people would experience for modern vs legacy
Using filmic recovery only … both methods look pretty close now
Adding in LPHLR for this one might add a bit more gradient if needed and the PC can handle the module