Cannot read property 'shadowRoot' of undefined;at api nextTick callback function
TypeError: Cannot read property 'shadowRoot' of undefined
at Function.<anonymous> (<anonymous>:2:1566875)
at <anonymous>:2:107463
at it (<anonymous>:2:138499)

自定义组件移除后，`operationFlow`可能还在操作Node，导致shadowRoot访问异常。