Options dialog does not set name of Qt version automatically when entering path in edit

When I add a new Qt version in the Options dialog and type the path to its qmake.exe into the edit, Creator does not display a name for this version automatically.
If I click on "Browse..." and select qmake.exe there, Creator assigns a name for this version, e. g. "4.6.3". The same should happen when I type the path.