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The only way to disable dithering is to use a dither texture that is just solid gray (50% luminance)

And you must always ensure that "separate texture page" is checked otherwise you will get weird visual errors.

Yes, but seperate texture page causes the sprite that has been seperated to just replace the checkerboard. 

yes, the checkerboard is the dither. If you just use a gray sprite there will be no checkerboard or dither anymore.