【报Bug】 uni.setNavigationBarTitle 后端接口返回标题文字 使用uni.setNavigationBarTitle渲染不生效

示例代码：

             onLoad() {  
                   this.postActivitys()  
        },  
        onReady() {  

            setTimeout(() => {  
                uni.setNavigationBarTitle({  
                    title: this.title,  
                })  
                console.log('this.title: ', this.title);  
            }, 5000)  
        },  
        methods: {  
            async postActivitys() {  
                const {  
                    data  
                } = await postActivity({  
                    id: id || 41239  
                })  
                this.title = data.data.article.title  
                this.content = data.data.article.content  
                this.click = data.data.article.click  
                this.public_at = data.data.article.public_at  
                this.publicationAddress = data.data.article.extend.publicationAddress  
                this.imgList = data.data.article.extend.images;  

            }  
        },

操作步骤：

             onLoad() {  
                   this.postActivitys()  
        },  
        onReady() {  

            setTimeout(() => {  
                uni.setNavigationBarTitle({  
                    title: this.title,  
                })  
                console.log('this.title: ', this.title);  
            }, 5000)  
        },  
        methods: {  
            async postActivitys() {  
                const {  
                    data  
                } = await postActivity({  
                    id: id || 41239  
                })  
                this.title = data.data.article.title  
                this.content = data.data.article.content  
                this.click = data.data.article.click  
                this.public_at = data.data.article.public_at  
                this.publicationAddress = data.data.article.extend.publicationAddress  
                this.imgList = data.data.article.extend.images;  

            }  
        },

预期结果：

可以修改

实际结果：

不能 修改 写死字符串可以 后端返回字符串 然后渲染 不可以