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This was breaking Metroid Prime 2: Echoes’s scanner in some rooms, such as the one in https://fifoci.dolphin-emu.org/dff/mp2-scanner/ It was found on Ivy Bridge on Mesa, the alpha value read back from the EFB was off-by-4 in multiple objects, which was a conversion error because int4() is equivalent to floor() and the value wasn’t always higher.