GUI freeze in gstreamer when unloading Video element

The actual problem was first seen in a larger application on an embedded device, but could be reproduced with the attached simple video app (video.qml) on desktop (Ubuntu 22.04, Qt6.5.8, gstreamer 1.20.3). There's a 5s GUI thread freeze, when unloading the video component (by clicking the orange rectangle). The freeze only occurs after the video already stopped playing with several of the following warnings:

QGstElement: failed to query position
QGstPipeline: failed to query position, using previous position

Afaiks, on the actual device, the video keeps playing, but the freeze still occurs.

The attached qtmultimedia workaround (0001-Work-around-5s-freeze-in-GUI-thread.patch) reduces the timeout to 10ms, though I can't fully assess, whether that would be a viable workaround (there's at least the warning Could not finish change state of "playerPipeline" ASYNC PAUSED PAUSED).