Layer shiftout show error

As an animator, I frequently create transitions where one scene fades out while another fades in. Typically, I set the outgoing symbol to fade out and the incoming symbol to fade in by adjusting their alpha levels: I’d set the incoming symbol to 0% alpha at frame 1 and 100% alpha at frame 40 xxx, using a classic tween for a smooth transition.

In the past, I encountered an issue where all the layers, groups, and shapes within the symbol would become visible through each other, resulting in a chaotic blend. My goal was to achieve a fade-out effect that looked like a "flattened" image without actually flattening it. Previously, I could do this by using the “Layer” blend mode, but this option has been removed in a recent update.