Qt Creator won't update pro/pri information in shadow build folder

When there is some modification of the pri/pro files,the information seems not to be updated correctly to the shadow build folder.
Some of the impacts are:
When we modify pri/pro files manually,Qt Creator still use previous edition,e.g. won't use new linking settings.
When we add new class to project,Qt Creator won't compile it at all.(This can be reproduced.)
When we refactor a class's name,Qt Creator will say can't find the file when recompile.

Only way to solve this is to delete the shadow build folder manually.

But how can problems as serious as this exist in an official release?Does any other body have this problem?