What steps will reproduce the problem?
(1) Press space to open Quick view
(2) Use arrow keys to navigate between files
(3) Reach end of directory
(4) Use the arrow keys to try to go further down the list

What is the expected result?
The last file is previewed.

What happens instead?
The preview wraps around to the first file/folder in the directory.

Let's consider removing the carousel behavior. Bounding the preview list to match the directory will help with navigation and knowing where in the list you are.