Regression: Defining an Animation Item in a separate file causes a segmentation fault on application exit

A QML file that uses an Animation Item (NumberAnimation in this example) that's defined in another external QML file will cause the application to crash on exit with a segmentation. The issue doesn't occur if the animation is never run. The issue also doesn't occur if the animation item is completely defined in the containing file as opposed to being defined in an external file.

A minimal example to recreate the problem has been attached to the report. Running main.qml with qmlscene, clicking the red square to run an animation, and then closing qmlscene will cause a segmentation fault.