Some Imported Sprites Appear White in Unity – Can't Modify Material

Hi everyone,

I recently imported some sprite assets from the Unity Asset Store, but some of them appear completely white in the Scene and Game view. Other sprites from the same pack display correctly.


Checked the Sprite Renderer component – The affected sprites have a material assigned: Sprite-Lit-Default.
Tried to change the material, but it’s grayed out with a message: “MaterialPropertyBlock is used to modify these values.”
Why are some sprites appearing white, and how can I fix this? Could a script be overriding the material settings? If so, how do I check?

Any help is greatly appreciated!