When an asset package is imported into a project, all materials may appear as pink materials. This visual anomaly indicates an issue where the rendering engine cannot correctly process the assigned shaders, resulting in the fallback pink materials display. This problem commonly occurs when the imported assets utilize shaders incompatible with the project's current render pipeline, such as a mismatch between built-in render pipeline shaders and a project configured for the Universal Render Pipeline (URP). Missing or corrupted shader files, or shaders that have not been upgraded for the target Unity version, can also lead to materials appearing as pink materials.