Base Layer becomes Black & White when a new layer is added


I'm building a slide interaction with three steps. I want to show layers when the slider is dragged to point zero and point 2. The initial position is in the middle. However, when I add a layer, the base layer becomes black and white. How can I retain the original colors of the base layer even after adding a new layer?

Is it not possible to add transparent layers, where each layer has an additional element on the base layer?

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