A 35-year-old man undergoes canal-wall-up mastoidectomy for primary acquired cholesteatoma with ossicular erosion. Pure-tone audiometry performed 6 weeks postoperatively shows an air-bone gap of 25 dB with bone conduction thresholds elevated by 15 dB compared to preoperative baseline. The audiogram pattern marked **B** in the diagram is observed. Which of the following best explains the postoperative hearing loss pattern?
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