It could have been a situation similar to something brought up a bit earlier in this thread - Sauron anticipated Frodo's activities and let him come through Mordor, but underestimated the Hobbit and expected him to claim the Ring before reaching the Cracks of Doom. Then Sauron would know exactly where the Ringbearer was, send a Nazgul, and get the ring back. He knew Frodo's will wasn't strong enough to master the Ring. Frodo's resitance and Gollum's unexpected role messed up Sauron's plans.
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