Freeze when closing certain QML files

Steps to reproduce:

1. Open a QML test file that contains a call to e.g. createTemporaryObject. For example: qtdeclarative/tests/auto/quickcontrols2/controls/data/tst_button.qml.
2. Ctrl+Click on createTemporaryObject to open it.
3. Ctrl+W to close the file. It will take several seconds, even on a powerful machine.

On a less powerful (AMD Ryzen 5 5600X 6-core) but only months old Windows, it took 32 seconds for Creator to become responsive after closing the QML file.