make a custom state that is of the type of content rg 1 is, and call it something like ‘selected value’ and then in the rg 2 use the custom state value as the value used in filter constraints
don’t know why you are using the advanced filter, or why you are not putting the constraint into the search itself…if you share more information about your data structure etc. it would be easier to point out what else you might be doing wrong.