【报Bug】【鸿蒙】getBackgroundAudioManager在鸿蒙系统下playbackRate倍速设置无效

示例代码：

<template>  
    <view class="listen1">  
        <view>  
            <button @click="play(1)">播放1倍速</button>  
        </view>  
        <view style="padding-top: 10px;">  
            <button @click="play(0.5)">播放0.5倍速</button>  
        </view>  
        <view style="padding-top: 10px;">  
            <button @click="play(1.25)">播放1.25倍速</button>  
        </view>  
        <view style="padding-top: 10px;">  
            <button @click="play(1.5)">播放1.5倍速</button>  
        </view>  
        <view style="padding-top: 10px;">  
            <button @click="play(2.0)">播放2.0倍速</button>  
        </view>  
        <view style="padding-top: 10px;">  
            <button @click="stop()">停止</button>  
        </view>  
    </view>  
</template>  

<script>  
    export default {  
        data() {  
            return {  
                title: 'Poetry',  
                src: 'https://hanyu-poem-voice.cdn.bcebos.com/man/728cc93938e04276909386ee5ae85d6b.mp3',  
            }  
        },  
        onLoad(options) {  
            this.initAudio()  
        },  
        onUnload() {  
        },  
        methods: {  
            initAudio() {  
                try {  
                    this.audioManager = uni.getBackgroundAudioManager()  
                    this.audioManager.title = this.title  
                    this.audioManager.onWaiting(() => {  
                        console.log('音频缓冲中')  
                        this.loading = true  
                    })  

                    this.audioManager.onCanplay(() => {  
                        console.log('音频可以播放')  
                        this.loading = false  
                    })  

                    this.audioManager.onPlay(() => {  
                        console.log('音频开始播放')  
                        this.playing = true  
                        this.loading = false  
                    })  

                    this.audioManager.onPause(() => {  
                        console.log('音频暂停')  
                        this.playing = false  
                        this.loading = false  
                    })  

                    this.audioManager.onStop(() => {  
                        console.log('音频停止')  
                    })  

                    this.audioManager.onEnded(() => {  
                        console.log('音频播放结束')  
                        this.loading = false  
                    })  

                    this.audioManager.onTimeUpdate((e) => {  
                    })  

                    this.audioManager.onError((e) => {  
                        console.warn('音频播放出错:', e)  
                        this.loading = false  
                    })  

                    console.log('音频管理器初始化成功')  

                } catch (e) {  
                    console.warn('音频管理器初始化失败，使用模拟播放:', e)  
                    this.loading = false  
                    this.fallbackToSimulation()  
                }  
            },  

            play(rate){  
                console.log(rate);  
                this.audioManager.title = '播放'+rate  
                this.audioManager.playbackRate = rate  
                this.audioManager.src = this.src  
                this.audioManager.play()  
            },  
            stop(){  
                this.audioManager.stop()  
            }  

        }  
    }  
</script>  

<style scoped>  

</style>

操作步骤：

let audio = uni.getBackgroundAudioManager
audio.playbackRate = 2.0

预期结果：

可以倍速播放

实际结果：

无效果，只能按照1倍速播放