Out of focus lyrics become unblurred when text is moving in fullscreen view

[RhapsodySL]

When in fullscreen view, the lyrics at the bottom of the screen (which are normally blurred) become unblurred when the lyrics are automatically moving. I've recorded a video to demonstrate this (the quality is really bad, thank you imgur, but it gets the point across). OS is MacOS Sonoma public beta.

https://i.imgur.com/LV7MiAg.mp4