Suggested Japnese text can not be clicked to be selected

When Japanese input (Hiragana) is on, and you type something in QTextEdit, it shows a drop down with some suggestions. Those suggestion can not be clicked to be selected. It works if tab or space are hit (some time Tabs do not select anything rather shows 4 spaces in textedit).

Clicking on a suggested Text gives the following output:
"Warning: Window move completed without beginning"

This can be easily reproduced with Qt's example "Address Book"

1. Launch AddressBook in Qt samples
2. Click the "Add" button to open "Add contact" dialog.
3. Type contact name in Japanese and click any suggestion in the popup window.

Result: The suggestions in the popup are not clickable

If Mouse click is done in native Mac application (even in Finder) for same Japanese case it works.