Proteus-4 has green spots with 2x upscale

Hello
I have noticed that Proteus-4 with upscaling 2x produces very strong green spots in the shadows.
With 4x I hardly see any problems here.
Is this a known problem and should 2x be avoided?
Is 4x always used internally at higher resolutions or is it possible that a mixture of 2x and 4x is sometimes used internally?

I’m using TVAI 5.2.3 with an RTX3090

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