Can be reproduced with Media Player example when some .wma file has been opened. I tested with one of these:

https://filesamples.com/formats/wma

To reproduce:

• run Media Player example
• open a file
• press play, then pause it
• seek to some position
• wait for a while
• press play again

-> it starts playing from position that seems to match seek + the time waited

Instead it should start from the seek location.

In Qt 6.2.6 the issue is also more visible, there the slider moves forward after seeking.