models – Material diffuse Colour is not correctly showing on unity 2020

I have a model which has been exported in Unity 2020, it is not showing the exact colour as I have in max. Instead, it showing white colour in diffuse. But if I bring the same FBX into unity 2019 then it’s showing the right colour.

I see that unity docs states something like this:

If a diffuse Texture is set, it ignores the diffuse color (this
matches how it works in Autodesk® Maya® and Autodesk® 3ds Max®).

But this is true for Unity 2019 but its picking the right diffuse colour. why?