Issue description
In some situations (I wonder which) the calculated material gets less when you want to copy more:
Copying a planned belt
Copying an existing pipe
Expected behavior
Material calculated properly.
Reproduction steps
Tested on 0.4.13 (148) and 0.4.14 (150)
Game version
v0.4.14 (150)
Attachments
CopyMaterial.save
Files not imported: CopyMaterial.save
