I sincerely doubt this is what's meant to happen...
(Spoilers of course)
Speaking of which, I'm truly stuck on this part, and I have no idea what I'm supposed to do. For some reason doing that bug lets me move the raft around, but it looks like a visual glitch and it doesn't look like it's supposed to happen, so I don't think that's what I'm supposed to do. Am I missing some other way to move the raft around? I've tried standing on it and trying to pull at trees and stuff, but nothing seems to work.