Materials losing their texture after copying another material. (Possibly a bug)

Questions & Answers
1

Hi, i have a problem on my project. The first time i open the project my “ground” material loses it’s texture, i always solve it by changing it’s color on the inspector to something else and then changing it back, however i find it quite annoying to do every time and i don’t really know what is the cause of it.
I have a script that makes said material to copy other materials so it has different colors depending on the level.

using System.Collections;
using UnityEngine;

public class GroundMaterialController : MonoBehaviour
{
    public Material materialToChange;
    public Material area1Material;
    public Material area2Material;
    public Material area3Material;
    public Material area4Material;    

    private void Start() 
    { 
        SetLevelMaterial();
    }

    private void SetLevelMaterial()
    {
        // CHECKS FOR GAMECONTROLLER INSTANCE
        if (GameController.instance != null)
        {
            if(GameController.instance.GetLevelNumber() != 0)
            {
                // SETS AREA 1 MATERIAL
                if (GameController.instance.GetLevelNumber() <= 5)
                {
                    materialToChange.CopyPropertiesFromMaterial(area1Material);
                }
                // SETS AREA 2 MATERIAL
                else if (GameController.instance.GetLevelNumber() <= 12)
                {
                    materialToChange.CopyPropertiesFromMaterial(area2Material);
                }
                // SETS AREA 3 MATERIAL
                else if (GameController.instance.GetLevelNumber() <= 20)
                {
                    materialToChange.CopyPropertiesFromMaterial(area3Material);
                }
                // SETS AREA 4 MATERIAL
                else
                {
                    materialToChange.CopyPropertiesFromMaterial(area4Material);
                }
            }            
        }        
    }

    private void OnApplicationQuit()
    {
        materialToChange.CopyPropertiesFromMaterial(area1Material);
    }
}

All other materials are identical except for the emissive color.
I’m using Unity 2019.4.29f1 (but i remember this ocurring on previous versions aswell).
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2

hello, Are use Universal Render Pipeline (URP)?, if yes try to do this:

Go to edit-> render pipeline → universal render pipeline → upgrade proect …

Hope it help