Adjust EXPERIMENT_FLAGS
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I do not have time to do every checking on the conflict with other scripts.
You can just disable this script.
This script does change YouTube UI and controls, so this is normal.
Something in this script interfere's with "Change YouTube Leftbar Subscription Links To Channel/User Video Page"
https://greasyfork.org/en/scripts/36400-change-youtube-leftbar-subscription-links-to-channel-user-video-page
It still redirects fine, but the part of the script that sorts channels with unwatched videos to the top as well as showing a total for unwatched subs and total subs is disabled.