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TDA4VM: How to solve the problem of subjective scenes with purple sky captured by RYYCy sensors?

Part Number: TDA4VM

Hi, TI experts,

About the issue of RYYCy data, TDA4VM: Can RYYCY data tuning be optimized? We have chosen another raw image and found the sensor companding knee points. After manually adjusting the white balance and CCM, the color of the 24 color blocks is relatively normal. The first image below is the original RAW of 24 color chart, and the second is the image tuned.

Then we applied the tunned parameters to subjective scenarios and found that the sky area appeared purple. The first image below is the RAW image of the subjective scene, the second is the tuned image.

My question is:  Do you have any suggestions about this phenomenon of purple sky?