Pipes not pasted correctly

Issue description

Some pipes are not placed when being copy-pasted or placed from the blueprint.

Reproduction steps

1. Load blueprint from this string:
   B704: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

2. Hover over terrain so that ghost is displayed. There will be two rows of pipes at the top (for crude oil and steam, steam is pointed by the red arrow):
   

3. After placing the blueprint, pipes for the steam are not placed:
   

Copy-paste has the same effect.

Game version and build number

v0.7.3 (b436)

Operating system

Windows

This is because the blueprint was created by manually removing pillars, which produced an incorrect state, and when placing the blueprint, it tries to find the pillars, but it fails to do so. So the fact that it can't be placed seems fine, but I'm not sure why validation does not mark it red.