Chrome and Edge still do a search on it in my default search engine even with []
https://[fe80::5ad6:9567:26b7:763b%18]:8081/
Even Hacker News doesn't think it's a link
On Mozilla Firefox after reenabling the separation into URL and searchbar it reports: "Invalid URL – Hmm. That address doesn’t look right. \n Please check that the URL is correct and try again." What does the '%' mean in there?
For link-local addresses, the part after % identifies the link. It's platform-specific - in Linux it's the interface name and in Windows it's an ID number.