Infinite wall jump bug is kinda hard to reproduce, but if you fiddle with the wall a bit by repeatedly jumping up and hooking/unhooking, you can make the green circle stay permanently green and jump up to the top.
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I did actually manage to find a easy way to reproduce it.
1 - Go up against a wall
2 - Look up
3 - Shoot hook
4 - wait a couple ms (basically let the sound effect play halfway)
6 - release hook
7 - spam jump
And as long as you're still right next to the wall you can move around and go up. (For example you can fully turn around)
As simple as that!