fix #2587: Resolve VAD multithreading issue (#2613)

majic31

2025-08-14 5115a066c971b2380c98f9be168e14869053eda1

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p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.