You could also try: (under your paragraph style>nested styles)

apply ‘quotes’ through 1 character
apply ‘body’ through 1 forced line break
apply ‘quotes’ through 1 character

Then add a forced line break after the end of the quote’s body – or you could replace ‘forced line break’ with ‘end of nested style character’ if you’re using line breaks in the quotes, that’d work as well.

To avoid having to reference the quotation marks, use ‘1 character’ instead. It works on mine, but so does just using a quotation mark as the nested style cue. Hope this helps, if you haven’t sorted it out already!