Regression: Can't open ui_xxx.h files

To reproduce:
1. Open Creator 9.0 project. My source tree is here:

/home/jarek/dev/creator-9

while my shadow build dir is here:

/home/jarek/dev/creator-9-build-63

2. Open plugindetailsview.cpp.
3. Hover over 5th line containing

#include "ui_plugindetailsview.h"

press Ctrl and click the filename.
4. The message box appears:
Could not open "/home/jarek/dev/creator-9-build-63/src/libs/extensionsystem/ui_plugindetailsview.h" for reading. Either the file does not exist or you do not have the permissions to open it.
I have this file in my build tree, however, the path is different:

/home/jarek/dev/creator-9-build-63/src/libs/extensionsystem/ExtensionSystem_autogen/include/ui_plugindetailsview.h

—
This is a regression comparing to 7.0 branch. In 7.0 linked header was opened, however, it worked only after project parsing has finished. Starting from 8.0 it doesn't open the header even after parsing is finished.