Edge island

The problem now is this: in the dungeon, where the passage guardian stands on the water, the boots of teleportation don't seem to help much: he absolutely refuses to approach the guardian...

I checked, and it's true, he doesn't approach the guardian. I'm sorry, this is a very annoying bug since you've almost completed the map. Thank you for letting me know. It's fixed!
I wish you a successful playthrough.