In order to get the structural grid (particularly the grid bubbles) to display correctly in a link, the user needs to override the display settings of that view for the Revit link from "By Host View" to "Custom." From there, change the "Linked View" under the basics tab of the "Revit Link Display settings" to correspond to the structural view level that you need. For example, if you are changing your floor plan, you should select the structural level that corresponds to your level. By setting this to custom, it will still allow you to turn objects from the structural link on and off. Otherwise, the easiest thing to do is to select "By Linked view" instead of "Custom" and only change the Linked view accordingly.