Memory leak in QClipboard::setMimeData() in Wayland

Copy anything to a QClipboard using

auto mimedata = new QMimeData();
...
QGuiApplication::clipboard()->setMimeData(mimedata);

Expected behavior:

The clipboard takes ownership of the data as stated in the documentation.

Actual behavior:

A memory leak is detected. Apparently the clipboard did not take ownership.

Only wayland appears to be affected, when using QPA_PLATFORM_PLUGIN=xcb I observe no memory leak.