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Was it over tightened? Tbh, I’d try either putting it in a vice and going back and forward with the drill to try and work it loose. Or just do the same with your hand. Had chucks seize up, but the solution has always been a bit more force than seems reasonable. I’m reluctant to give that advice tho - a reasonable amount of force is a very subjective thing.
Frozen with a phillips head screwdriver bit in it.