Only handle primary input in block interact event handler.

src/main/java/com/sk89q/worldedit/extension/platform/PlatformManager.java

@@ -25,6 +25,7 @@ import com.sk89q.worldedit.command.tool.DoubleActionBlockTool;
 import com.sk89q.worldedit.command.tool.Tool;
 import com.sk89q.worldedit.entity.Player;
 import com.sk89q.worldedit.event.actor.BlockInteractEvent;
+import com.sk89q.worldedit.event.actor.InteractionType;
 import com.sk89q.worldedit.internal.ServerInterfaceAdapter;
 import com.sk89q.worldedit.regions.RegionSelector;
 import com.sk89q.worldedit.util.Location;
@@ -209,6 +210,7 @@ public class PlatformManager {
 
         // At this time, only handle interaction from players
         if (actor instanceof Player) {
+            if (event.getType() == InteractionType.PRIMARY_INPUT) {
                 Player player = (Player) actor;
                 LocalSession session = worldEdit.getSessionManager().get(actor);
 
@@ -253,6 +255,7 @@ public class PlatformManager {
                 }
             }
         }
+    }
 
     /**
      * A default configuration for when none is set.