Pitch slightly decreases when scrolling back using the left arrow key

Open a song with VLC Media player
Click the "Play" button and listen to the song
After a while, press the "arrow left" key on the keyboard
Result: the song is scrolled back by 10 seconds. This is the expected result.

But: the song's tone pitch also slightly decreased. After 6-7 seconds, it recovers and the song sounds like before pressing the "arrow left" key. Please note: this is a bevhavior which I can observe with high quality studio headphones. If you try to reproduce the behavior using simple PC speakers, you may not observe it.

I'm using VLC media player 3.0.17.4. Vetinari. However, I noticed this behavior also with previous versions of VLC media player and with every song that I listen to.

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