I really think this is just ping/lag/desync issues
Well I hope so. The thing is, the other beans are also lagging but they never wagged their hands nor hovered for more than a second. That is why I reported only that bean.
Yeah, I think the desync is causing the animations to play weirdly
the game tries to predict where it thinks the bean will go next, and then adjusts it back to where they actually are when it gets the next update - so sometimes you'll see beans with bad connections doing things that shouldn't be possible... and sometimes they look like cheating (which is probably the most frustrating part of it)
If it was up to me, I'd make a big red hat appear on any bean that has a bad connection, just so it's obvious what's happening... probably why it's not up to me lol