Exposure difference between PC and Mobile preview if PP material applied with Before Tonemapping blendable locationmode

1. Create a PP material with blendable location Before Tonemapping selected
2. Feed a SceneTexture-PostProcessInput0 into Emissive Color input
3. Apply this PP material to a PP volume and put it into level with a unbound board
4. Switching between SM5 and ES31 preview mode
5. See the viewport has different brightness value
6. Fixing the Exposure in viewport, no difference while switching between the two preview mode

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