I can confirm this bug as well. Being trying to bypass it via finding a different map but no luck after ~12 hrs as I keep coming back to the same map. I actually watched him bug as well and all the attempts to lead him out resulted in failure as no matter how far he swim out he just swims back to the same spot and get stuck again.
Yep, dunno why it re-broke. I went into Live weeks/months/timemovesdifferentlyhere ago and it was working fine the 5 times I ran through his event. :/ We'll get it sorted, thanks!