SilverStripe PHP Forms - If I nest a SelectionGroup inside a FieldGroup, one of the related SelectionGroup_Items' Radio Box does not show up. Why?
You could add another fieldset then set it's attributes to id="hidden_field" aria-hidden="true". In the css document you could do the following.
#hidden_field{
display:none;
height:0;
width:0;
margin:0;
padding:0;
visibility: hidden;
}
This should hide SilverStripe Framework's query behavior. In my own php forms I had random brackets appearing whenever someone submitted a new form numerous times under different part-id numbers. I used this approach to hide the random brackets on my site.