How to fix materials in HDRP

Hello everyone.
Such a problem …
I created the HDRP project, importing all kinds of stones, houses, trees, characters. Materials break and are displayed in pink. After updating the materials, using “Edit - Render Pipeline - Upgrade Project Materials to High Definition Materials”, everything, except the trees and grass, is updated and looks normal.
How can this be fixed?

Trees and grass in your assets probably use a non standard shader. There’s no automatic upgrade path for this
You just need to recreate the material manually by assigning a valid HDRP shader, the correct textures and parameters

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