[REG 3.2.2 -> 3.3.0] JavaScript debugger: Cannot expand children of expression evaluators

1. Open project qtdeclarative\examples\quick\demos\samegame\samegame.qmlproject from Qt5's repository.
2. Configure the project to use Qt 5.4, so you don't run into QTCREATORBUG-13474.
3. Set a breakpoint at the first line of function startNewGame(gc, mode, map).
4. Run the project in debugger.
5. In the app, click "1 Player".
   The breakpoint is being hit.
6. In "Locals and Expressions" view, right-click "this" and select "Add Expression Evaluator for 'this'" from the context menu.
   An expression evaluator for "this" will be added in the lower part of the "Locals and Expressions" view.
7. Expand the just added expression evaluator for "this".
8. From the children becoming visible, try to expand "component".
   It doesn't work.

Expanding the children should be possible. In the upper half of the "Locals and Expressions" view, this works. In Creator 3.2, it used to work, too.