PrestaShop 9.0.0 is BETA, and should have never been portrayed as a stable relase, I never understand French open source, community tested without community, so many ruined upgrades or new users trying to build their business on 9.0.0, only to find base feartures do not work. rant over
There is a Regression bug(s) in 9.0.x where new attribute groups do not show the Texture / Color input fields in the Back Office. The UI simply omits the controls needed to assign colors or textures.
https://github.com/PrestaShop/PrestaShop/issues/38981
The attribute form UI has documented rendering problems (especially for “radio” or alternate attribute types) that hide or mis-handle expected fields.
https://github.com/PrestaShop/PrestaShop/issues/39018
Once a texture is uploaded, you cannot remove it in 9.0.x, and the color field cannot be cleared, unlike in previous versions.
https://github.com/PrestaShop/PrestaShop/issues/39397
These issues strongly suggest your problem is not due to your configuration or theme alone, but rather a core regression introduced in PrestaShop 9.0.0 and again, they should not have prompted people to use this, it's for developers only.
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