Wavesurfer v6.6.4 invalid progress bar

Question

Due to incompatibility with some packages on a Vue project, wavesurfer needs to go down to v6.6.4 from v7.7.0. And while trying to make player work again, I got stuck on progress bar.

Here's the problem: Progress bar is loaded with all its peaks from the start, it just expands as gets closer to finish:

this.baseAudioPlayer = WaveSurfer.create({
        container: this.$refs.container as HTMLDivElement,
        waveColor: COLORS.GRAY_400,
        progressColor: COLORS.BLUE_700,
        barWidth: 3,
        barRadius: 4,
        height: 28,
        autoCenterImmediately: true,
        normalize: true
})

this.baseAudioPlayer.load(url)

... // init events: audioprocess, init, ready, finish.
// on ready event wavesurfer play method is called

I thought it could be some issue with params in create, but even if I leave only container property, problem still occurs.

Before downgrading create also had fetchParams and dragToSeek params. Also timeupdate event was changed on audioprocess, cause on 6.6.4 such event didn't exist.