Xcode plist文件 - 注释消失，文件重新格式化

I have just noticed, that if you have an .plist file in your Xcode project (it does not matter whether it is the Info.plist file or other - in my case it was other .plist file) and you edit the file as a source code file (right-click on file Open As->Source Code File) and then you switch back to XML property List (right-click on file Open As->XML Property List), make some changes and save, then all your formatting and comments are dropped when you open it again as a source code.I have just noticed, that if you have an .plist