Enable/Disable expandable feature

Hi, I'm facing a problem with my grid when I want to switch expandable feature from enabled to disabled (or viceversa). No matter the call to notifyDataChange, if the grid starts with the expandable feature enabled, then I can't completely disable (at last graphically) it. Same happens in the opposite case, if the grid starts with the expandable feature disabled, then I can't enable it.

This is the plunkr with the same behaviour, I'm using Angular 1.6.6 (but in the plunkr is 1.6.5, I don't think should be a problem) and latest version of ui-grid.