Comment 39 for bug 1584203

Another issue:

If you build waterways they are part of the economy, so they are considered for the routing of wares. If you didn't have a ferry yard yet (no ferry), wares are lying at the flags of waterways which might be needed for a building. This can be very confusing if a building needs a ware which is needed to build a ferry yard, but that ware is lying at a waterway waiting to be shipped. To solve this one has to remove the waterway where the ware is waiting for shipping.

So either the tutorial should explain to build waterways only if a ferry yard is already build, or the routing of wares should not consider waterways if no shipyard is built yet.