Dynamically creating a video causes error with OpenGL backend

Reproducer attached. What original reporter reports is that if this reproducer is run on Raspberry Pi 4, then such error happens:

Could not fill context info: glGetString not defined or returned invalid value

I also tried on RPI5 (since RPI 4 is not a Tier 1 target) and can confirm that. The error happens. Nevertheless, it seems to not affect video loading and playing.

Since the issue is about OpenGL function call, I also tried on Windows with " QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);". So with OpenGL backend, a different error message also pops up on desktop:

failed to get textures for frame; format: 171

But again, the error seems to not affect anything. Video is played correctly.

So the problem seems to be that an item that contains video should not be pushed into StackView like that. On the other hand, if the item is set as initial item (uncomment line 14 and comment out line 13 of Main.qml), then the error goes away (regardless of error message).