JavaScript debugger does not show locals and expressions (Qt Quick 1)

1. Open demos/declarative/samegame/samegame.qmlproject from a Qt4 repository.
2. Select qmlviewer for running the project.
3. Place a breakpoint in startNewGame() at the line:

   createBlock(column, row);
   

   For me, this is line 50 in samegame.js.

4. Start debugging.
5. In the app, click "New Game".
   The breakpoint is being hit.
6. Step over.
   "Locals and Expressions" view becomes empty.
7. Step over.
   "Locals and Expressions" gets some content again.
8. Step over.
   "Locals and Expressions" view becomes empty again.

"Locals and Expressions" should always display what it promises.