Material You input forms background color different

Hello,

I think its strange to see the background “blue” color on the inputs. Because some have it others not…

For example Kitchen Sink:

I think this difference makes no sense. I personally dont find the background color in the top form inputs appealing. I prefer the “transparent” look. That CSS must be a bug

This is how it stated in Material You guideline. Don’t like, you can disable background with CSS variables

It is just strange some inputs have it others not. Can’t understand the difference. Thanks! I though it could be a bug.

By the way is possible to not use material you? and still use the old “material” ? with the v8 features and improvements? Because theme colors are not “real” colors but a tone of the theme color I set.