Fix prefix concatenation in timestamp post-processing for sensevoice (#2670)

slin000111

2025-09-20 88b464edb94531ba98744a5338965af539ab18ec

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one    12
two    1
three    2
four    3
five    4
six    5
seven    6
eigh    7
nine    8
ten    9
eleven    10
twelve    11