Links to YouTube posts get turned into broken video URLs

On lemmy.world, this is a link to a post and works. Piefed tries to make it a video link which does not.

https://nord.pub/post/251102/comment/1563163

https://lemmy.world/post/48065584

(unrelated, but to try to find this community, I clicked the magnifying-glass-looking thing to search and it just yelled at me that I couldn't search for a community in the wrong format. If I don't know where a community lives or its exact name, how is that even useful?)