In the Ruleset, change:

When a Vessel Sinks, all Captains (except for those who share a Side with the controller of the Sinking Vessel) who control a Vessel which created a Shot in the same square as the Sunk Vessel during the processing of most recent Watch gain 10 Treasure.

to:

When a Vessel Sinks, all Captains (except for those who share a Side with the controller of the Sinking Vessel) who control a Vessel which created a Shot or Placed an Object in the same square as the Sunk Vessel during the processing of the most recent Watch gain 10 Treasure.