Saving a faction from extinction

[Virtualaughing]

It is so hard to re build a faction when they are stuck. Currently I have a trader wing with trade blacklist. Only the factory building related goods are selected.
I have made a complaint about "last order is can not be completed". I have found out why. When NPCs building a shipyard the pier docks are near to the end in the building order. When a shipyard/wharf list the same goods as the required goods for factory building it can be problematic.
Currently the "find build task" seems to be working. Any way to force the thing? It would be nice to understand why the building ships sometimes just wander around.