Memory leak when passing QByteArray from C++ to QML

Hello,

We have found a memory bug/clean up issue when passing QByteArray from C++ to QML.

In the attachment, you can find a minimal example of the problem.

When we call a Q_INVOKABLE function that returns a QByteArray from a QML signal handler, the memory of our application keeps rising. In the example this is done by clicking in the application. Checking the memory usage you will see it rise, but never fall.