Issue Jumping with Magnetic Plate Locked Grid - Obstacle Detected

So I have an confusing dilemma when trying to jump with another grid. The goal/idea is this grid would be attached closely to the ship, however, there's a certain distance away that's required but there doesn't seem to be any reason for a collision. The original version had blast doors on each side of the container which I thought was the cause but removing that and adding this two block space had no effect. The only thing that seems to work is adding around a 3/4+ block distance with a large landing gear to attach to the container.

In the attached files the "Large Ship Jump Drive" this vessel has magnetic plates that attach to the container "Subgrid Jump Issue". When attempting a jump, the game will report an obstruction within 0 to 10m (the distance varies depending on orientation of the ship). I tried a few things:

• Moved the jump drive up a block and rebuilding it.
• Moved the attached grid down a few blocks (eventually enough space does make it work)
  
• Added some blocks to the attached grid.
  
• Moved the cockpit further away from the attached grid.
• Restarted/reloaded save.
• Even if detached but within a few blocks above vertically (the LCD side) it will not allow a jump
  
• Discovered if I position the attached grid sideways, it will work.
• Discovered if I position the ship not centered on the attached grid (e.g jump drive further forward, it will work.)
  

I'm really just curious:

• Is there some invisible object/block I can't see?
• Is it something to do with the construction?
• Are magnetic plates an issue somehow?
• Is there some minimum distance?

I have successfully jumped other ships with grids attached via magnetic plates, gears and merge blocks but there is something peculiar here. Any advice would be amazing, thank you!