But that is one of the issues we hoped this flag would solve. There is nothing wrong with the model itself it's something in the engine and that issue has been in mantis for ages. It's reproducible with retail assets as well just hard to do due to insufficient docking points and locations.
On that same model in prior testing the following works:
1 container docked anywhere
2 containers docked as long as one is at the front and one at the back (although this behavior seems to be somewhat different either in recent builds or due to having the flag enabled)
3 or 4 containers docked as long as 2 or 3 are on either front or back and you destroy the single one on the other side.
So something goes wrong with the engine when those containers are docked at angles. Doesn't matter what is docked, size, etc. I even reproduced the behavior with a simple long rectangle (which I think is attached to that old mantis report).