I feel inclined to agree that it’s a display bug. Forcing the texture to use SRGB via the Encoding Override setting in the texture also makes it look more correct in the editor and preview (though it’s still not exact), it greatly messes up how your materials look in game. As much as it’s bothering me that the normal maps don’t look as they should in preview mode, I’m finding that I get the most accurate results by leaving them alone.