[QGIS-Developer] my qgis standalone application can't load *.qgz file's saved extent

[weskerjiang at sina.cn]

I make a standalone application,i save a *.qgz,when i saved this file,the extent is 1:500.but when i open it from my application,the initialized
 extent is not 1:500 but the full extent,when i open it in QGIS 3.0,everything is fine,the initialized extent is 1:500,so what is wrong with it?
i use          QgsProject::instance()->read(projectFile) to load the file
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