I think the point of the bowline is that it can (nearly) always be undone whatever load it has been under.I thought the whole point of the bowline was that it didn't shake apart.
I've never had it happen. I've never even had one loosen.
It can happen if you don't take up on the knot properly and have too short a tail, or if you're using yellow polypropylene 3-strand.
https://www.calameo.com/read/0039508930c88cf41605b?authid=fBTAkezaqJyXA book I have calls it a Sylvain knot. An Internet search comes up with no such thing. Is there another name for it?