Ships at dock have options to fish, gather sugar cane, arm themselves with muskets, etc.
Steps to reproduce:
1. Start a new game
2. Found a city on a coastline
3. Sail the ship to the coastal city
4 In the colony display, right click on the ship
5. In the context menu that pops up, there is a 'Change work' option, but that shouldn't be there. Selecting items within it seems to have no effect.
6. Other inappropriate options may be shown, such as offering the Arm if there are muskets in the colony, etc.