response.body.path does not work

I am trying to use a JSON field from the response of a request into the URL of another request. For that, I use `response.body.path`. However it doesn’t seem to work, the “rendered preview” is always empty and the variable expands to nothing. When I type the same JSONPath in the filter field, it give me the right value so I know my JSONPath is correct. Even when I type just `$` in the path, the preview stays empty.