UseWatch with an input field that has a default value returns undefined when the input field is not changed

What you were expecting: I would expect that useWatch returns the default value of the field.

What happened instead: useWatch returns undefined, untill I change the watched field.

Steps to reproduce:

create a form with an input that has a default value, then have another component use useWatch on that input field, the resulting value is undefined untill you change the input.

Related code: I created a WatchBug component in the PostCreate file. It watches the Published at input. you see that initally the value returned is undefined. https://stackblitz.com/edit/github-mjvobu?file=src%2Fposts%2FPostCreate.tsx

Environment

• React-admin version: 4.15.2
• Last version that did not exhibit the issue (if applicable): 4.8.4 does not show the bug, I did not try other versions inbetween.

Working version on 4.8.4 https://stackblitz.com/edit/github-ladv9x?file=src%2Fposts%2FPostCreate.tsx