Unnecessary reference remains in material instance when using StaticSwitch in material

1.Create a material that switches textures using StaticSwitch.

2.Create a material instance and toggle the switch to overwrite the texture.

3.Then return the static switch settings to their defaults.

4.Textures that are not used for rendering are referred to, and are in memory.

Expectation:
I want to remove unused texture references after switching static switches.
When cooked if possible.

1.Create a material that switches textures using StaticSwitch.

2.Create a material instance and toggle the switch to overwrite the texture.

3.Then return the static switch settings to their defaults.

4.Textures that are not used for rendering are referred to, and are in memory.

Expectation:
I want to remove unused texture references after switching static switches.
When cooked if possible.

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