Flashing columns in list view when expanding folder (dark mode)

I am playing around with Big Sur and Monterey at the moment to evaluate if I upgrade.
If I in dark mode expand a folder in list view all light rows flash. Is this a feature or a bug?
The flashing does not appear in light mode, but both in Big Sur and Monterey.

A screencast may be useful here.

Sure here it is: FlashingLight.mov - Google Drive

It happens in 3.8 and 3.7.2 too.

Ahh. That’s pretty subtle. I was expecting something more in your face :smiley:

The behavior is noted. Development would have to assess this. Thanks for your patience and understanding.