Setting texture wrap mode from script

I want to set Texture2D wrap mode to Repeat from script. Unfortunately this does not seem to work.

             fillTexture.wrapMode = TextureWrapMode.Repeat;
             fillTexture.Apply();
             EditorUtility.SetDirty(fillTexture);
             AssetDatabase.SaveAssets();

Texture will be for a short time in Repeat mode indeed, but then after reloading scene it will be shown in Clamp. It is in clamp mode in Editor.

What am i doing wrong? At first i tried only the first line of this code, but it does not work too.