debounced function not working after Bun sleepSync

I found that debounced function was called at the first time and never be called again If I use sleepSync, a sync version of sleep provided by Bun runtime.

import { sleepSync } from "bun";
import _ from 'lodash'

let count = 0

const debouncedFn = _.debounce(() => {
    count++
    console.log('>>> debouncedFn invoked, count:', count)
}, 1000, {
    leading: true,
})

for(let i = 0; i < 10; i++) {
    console.log('#', i)
    debouncedFn()
    sleepSync(2000)
}