PIXI.DisplayObjectContainer calls updateTransform at the start of getBounds to help avoid the bounds being out of date.

Author: photonstorm

src/pixi/display/DisplayObjectContainer.js

@@ -328,6 +328,8 @@ PIXI.DisplayObjectContainer.prototype.getBounds = function()
         return PIXI.EmptyRectangle;
     }
 
+    this.updateTransform();
+
     var minX = Infinity;
     var minY = Infinity;