Changing Texture Parameter via SetMateriaInstanceTextureValue remain old texture's reference

When editing the texture parameter of Material Isntacne using Editor Utility Widget, the old texture is linked with the SoftReference. When change the texture parameter in Material Instance Editor, it's correct because don't remain old texture reference.

1. Open attached project.
2. Right click and Select "Run Editor Utility Widget" with "EUW_MaterialEdit".
3. Open the "EUW_MaterialEdit widget", select asset with "Material_Inst_Before".
4. Press "SetTexture" button.
   Then change the Texture Parameter with "Material_Inst_Before".
   This EUW change the texture parameter in  selected assets.
5. See  this asset reference with reference viewer.

Result:

Keep old texture's reference.

Expect:

Break old texture's reference.

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