There are some inherent severe bugs when it comes to Twitch collections that should get priority to be fixed. I think the reason very few streamers use this feature is because of how broken it is.

⠀1. The default internal links to collections shows an error.

"Sorry. Unless you’ve got a time machine, that content is unavailable." error page which then redirects you to the first video of the collection. Changing the structure of the URL makes this not so, which makes me think its an old oversight/workaround that can easily be repaired.

Examples how to replicate:
Shows error: https://www.twitch.tv/collections/OIpBrhiazhakWA?filter=collections
Does not show error: https://www.twitch.tv/cragsand/collection/OIpBrhiazhakWA

⠀2. If the first video in a collection is missing, unpublished or broken, none of the videos in the collection will play.

⠀3. Having more than 99 videos in one collection will not show the 100th video in the user interface, it caps off and is not clickable.

Progressing to the 100th or 101th video does work if you fast forward to the end of the VOD and allows the page to progress automatically. This is also an oversight in the user interface.

Example of a collection with 100 videos in it: https://www.twitch.tv/collections/nkGV9BqNYhaAow

Video showing the bug: https://i.imgur.com/gTtXGSL.mp4

⠀4. Twitch channels with over 100 collections can't save any more.

I haven't reached that level yet for any of the channels I help as an editor for, but will eventually. This also has a uservoice report here:

https://twitch.uservoice.com/forums/923368-video-features/suggestions/43874217-remove-update-collection-limit

Thank you developers!
Best Regards
Crag