Invidious: Channel URL / Video ID collision

[austinhuang0131]

In short, https://youtu.be/<id> should be redirected to https://invidious.instance/watch?v=<id>, not https://invidious.instance/<id> (even though that works in most situation).

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Try:

• Redirect https://youtube.com/watch?v=dQw4w9WgXcQ. You get rickrolled.
• Redirect https://youtu.be/dQw4w9WgXcQ. Without redirect you should also get rickrolled, but with redirect this goes to a channel (https://youtube.com/dQw4w9WgXcQ) whose custom URL is dQw4w9WgXcQ, thereby inconsistent.

See also iv-org/invidious#2347