Piston Head Merge Issue 1.209.024
The Piston Head of an Extended Piston (Either model) for both Stations or Ships, will merge to the grid when copy/pasting the grid or pasting it in as a blueprint IF there is a block face near it to merge to. This happens with the experimental feature "Share inertia tensor" both enabled or disabled in game settings as well as enabled or disabled on the grid if it's on in game settings.
I was successfully able to replicate this after extending the piston to 3.6m or further. See screenshot for what it looks like before and after placing the copied grid.
I've attached this grid as a blueprint as well.
The only way to fix this is to remove the block that the piston head is merged to. If it's surrounded by blocks, then they all must be removed.
This looks like it affects PS as well, I saw a user on Discord mention the same exact issue.
I have the same bug 
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