I have not tested this elsewhere and have not tested it again with other AVs. But the phenominon is real.
There are other 'strange' happenings in this space on the boundary of the two sims (what I now call the Bermuda effect).
I highly recommend (based upon my experience at this location)that you do not create complex objects that straddle sim boundaries, or move complex objects onto a sim boundary.
Building on this space can cause untold headaches with aligning objects, caused by what I can only assume is a 'fight' by the two sims over which one controls the object's position.
When I moved one of my yachts today across the boundary and then back a couple minutes later (sailing in the bay), I then left the area (and then reloged in) upon return to my marina I find that the yacht is 3/4 missing and nowhere in sight. No money had been put back into my account (as if it had been deleted). So I was missing a yacht and the cash spend to build it. (a nice Linden who will remain nameless, gave me the money to rebuild).
Before expanding my marina (I owned land on both Shipley and Hawthorne) I had the building on one sim (shipley) and the first yacht on the other sim (hawthorne), If I teleported into the shipley side (2 meters from Hawthorne) I could wait 'forever' and my yacht would never rez (unless I crosssed the sim boundary), I could see other objects and land far in the distance in the other sim, but the yacht would be 'invisible'.
So... after all this, which is mostly anecdotal. I am going to put signs up warning people of the Bermuda effect in this area

I hope that this helps others who may have been tearing out what little hair they have left, to understand what might be happening to them on a sim boundary. Or maybe its just my 'Bermuda triangle'.
-Mickey