Had the same issue, my 3D modeller exported again all textures in 8bit instead of 16 and tadaam it works! For the washed-out 16 bit, the settings were sRGB false and compression mode Default. For the corrected 8 bit it imported already with sRGB true and compression mode Default. I also tried switching on and off sRGB or changing Sampler Type in the Material itself on the Texture node but none of these worked only re-importing 8-bit Textures and Create Material of those new ones.
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