X3-Roads Highway-Fence Clearance / Identical Buildable

I've been trying to build some road-blueprints and ran into a few issues when trying to replicate the double-fence that is used by some of the templates.
At times it seems to work and other times, I get the "An identical buildable is already built there!" message.

I haven't been able to figure out what causes the issue to appear, as I've built double-fences using the same components before.
Error occurs as multiplayer host (haven't tried singleplayer).

I've also seen that some of the showcase screenshots use a functional double-fence, so it feels like the error is on my side.
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