Upscaling in Minecraft Bedrock produces 2 screens

[Epicsk8r37x5]

When activated, lossless scaling creates a 2nd screen inside the upscaled output in Minecraft Bedrock, which scales with the scale factor. I cannot screenshot this as it only captures the smaller screen.

Additionally, although upscaling with FSR works in windowed mode, LS1 upscaling produces a black and white wire mesh.