When I tap an item, it doesn't seem to register and add a checkmark on the right. When I tap a subsequent item, it shows a checkmark next to the one I tapped previously, but not for the one I just tapped, and so on, always remaining one action behind.When I tap an item, it doesn't seem to register
阅读背景：
在浏览苹果的ToDoList应用教程时，点击条目不会正确地添加“完成”复选标记。
来源：互联网
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