title: react final form conditional form fields are not getting values while rendered
body: <p>I have a field in a form that I want to render based on another field's value.</p>
  
  <p>I listen to "OnChange" event of the field, and then trigger form.change of the new field (which is not rendered yet), but it won't get the value while rendered.</p>
  
  <p>I created a sandbox for the issue: <a href="https://codesandbox.io/embed/priceless-keldysh-gfd3b" rel="nofollow noreferrer">https://codesandbox.io/embed/priceless-keldysh-gfd3b</a></p>
  
  <p>THe expected result: when selecting "Heat", scaling factor should be displayed and get the value '1'</p>
  
  <p>What is the best practice to solve that? assuming there are a lot of dependencies inside a form.</p>