Artifacts and glitches in Photo.app while scrolling grid

Hello,

I've just noticed some weird glitches and artifacts appearing in Photos.app only while scrolling grid with pictures. Glitches can be seen only in Imported and Screenshots from iPhone folders so far. They can't be captured with screen recording utility e.g. QuickTime. After starting a recording they dissapear.

Here's a video I recorded with my iPhone:

https://www.youtube.com/watch?v=jIWmZXXvMPw

What could be the problem?