Greasy Fork

Recently the scripts seemed to disappear all videos below "Shorts" from main page.

Which browser? And can you confirm you're on the latest version of the script? Also, do you have other YouTube-related extensions that change the layout significantly?

Since the change to utilizing YouTube API introduced in v1.2.0 (due to changes to YouTube's layout, which caused the old method to stop functioning properly), the script will now perform scroll detection to check when videos grids enter your browser's viewport, so that API calls will only be done when necessary.

Assuming nothing breaks, in enabled pages (homepage and watch page), videos grids will indeed be visually transparent upon first loading the page. But as you scroll down, API calls will be done on them to determine their views counts, and they'll gradually appear if their views aren't below the configured thresholds. But this process should typically be done in less than a second.