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If it is, it points to reuse of a tx key, which isn't meant to happen. If it does, a key image collision means that only one of those outputs is spendable, so the wallet selects the larger amount, unless that output was spent already. This causes a discrepancy betewen reported received inputs and payment total. Since tx keys are 256 bits, this should never happen except if done on purpose, or if a sender uses a bad PRNG.