In DRM info app on Asus 6z show Wide Colour Gamut not supported but specs says it is DCI-P3 screen where as on Redmi k20 pro app shows wide colour gamut supported.
Zenfone 5z supports both wide dolor gamut and HDR (has 95% dci-p3 color gamut Zenfone 6 has a HDR 10 capable panel And has 100% Dci-p3 color gamut Probably some issue with that particular app