The value of stripShadowsOffVariants being true triggered the creation of RenderTexture in SetupForEmptyRendering, causing GC. Why is this?

Unity Engine
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This is the SetupForEmptyRendering method in MainLightShadowCasterPass. Our project has disabled shadow rendering for the main light; therefore, the value of renderingData.shadowData.supportsMainLightShadows is false. This triggers SetupForEmptyRendering to execute the function that creates RenderTexture, causing a small amount of GC every couple of frames. Can you explain why this happens? The value of renderingData.cameraData.renderer.stripShadowsOffVariants is True; does it mean that the shader variants are being stripped?
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@AlanParrick For Stripping disabled variants. You can learn about this topic from [2022.1] Add Shadow and Additional light variant stripping by lukaschod · Pull Request #5544 · Unity-Technologies/Graphics · GitHub