Field is incorrectly focussed when using Wizard

### Are you submitting a **bug report** or a **feature request**?

bug report

### What is the current behavior?

When using a Wizard form with final-form-focus, similar to the react final form docs example, linked in the sandbox below, when submitting one page of the form, the first required input on the next page is focussed, even though no error is displayed, this also means the error is then displayed on any click causing blur of the input

### What is the expected behavior?
Inputs are only focussed on each page after clicking 'Next' or 'Submit'

### Sandbox Link

https://codesandbox.io/s/github/final-form/react-final-form/tree/master/examples/wizard?file=/Wizard.js:1831-1835

### What's your environment?

final-form-focus: 1.1.2
final-form: 4.19.1
react-final-form: 6.4.0
browser: Firefox Developer Edition
node version: 12.13.0

### Other information