Tier 2 alloy building doesn't use motes?

[Ohirra]

The tier 2 alloy building doesn't appear to have any motes upkeep, even though the tier 3 building uses four motes.

The tier 2 consumer goods building uses two crystals, and the tier 3 uses four crystals, which is to be expected.

So why is there this odd space where you'd expect the tier 2 alloy building to have a two motes upkeep, but it doesn't?

 

[Anzaman]

I imagine some oversight happened while they were changing how buildings work with 4.0.