I am building a vessel which costs 147 manufacturing points.
I am giving my shipyard 140.5 manufacturing points,
The vessel displays in the shipyard as taking 2 turns to build; that means the shipyard will let 134 manufacturing capacity of the second build turn going to waste. Or does it?
Rather than what the build queue displays (2 turns per ship) I am actually building a transport every turn now...

Is this a display bug, where un-used manufacturing capacity rolls over to the next ship, but the build queue isn't registering that?
Or is it my shipyard somehow producing more than it should be able to?