Well, this blog post was originally filled with really big screenshots, but I have decided to remove them after finding that Juggernauts are not quite so rare any more! This is why I have been so lucky to find one.
After finding the first one (which did not respawn once sunk), I later went back out and found a second one. This one, when sunk, did respawn - but only once.
The respawning juggernaut was found here:
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I guess they are back to how they were before?