Dunno if this helps your nVidia investigations but with my GTS 250 using 331.82 drivers, I only get the blue and red chroma channels (no luma or green) when using NNEDI3 to double luma resolution. If I set chroma upscaling to NNEDI3 I only get green and luma (no red or blue).
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TV Setup: LG OLED55B7V; Onkyo TX-NR515; ODroid N2+; CoreElec 9.2.7
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