[Bug v7.0.0] useField returns undefined value on initial render despite initialValues being set

[yurii-oliiarnyk-finsight]

Description

Hi, thanks for your work on the library!

We're encountering a blocking issue when trying to migrate to react-final-form@7.0.0 to prepare for React 19.

Problem

When initialValues are passed to the <Form />, the corresponding fields registered via useField initially return value: undefined. This was not the case in earlier versions.

It seems that the field state is now derived via form.getFieldState() during initialization here — but this runs before the field is registered here, so the field state is not available at that moment.

As a result:

Fields render with value: undefined on the first render. Components relying on the initial value (e.g., to initialize local state or trigger effects) fail or misbehave.

Expect result:

Fields render with defined value on initialize as it was before in v6.5.9

Sandbox Link

v6.5.9 https://codesandbox.io/p/sandbox/h7lk86
Logs:

v7.0.0 https://codesandbox.io/p/sandbox/6cd2fz
Logs:

[chevvy]

Noticed the same issue while migrating to expo 53/React 19. At first, I assumed there was something wrong with our ref usage and React 19 changes, but in the end I figured final-form might be at cause.
In the end:

• We kept the changes to expo53/react 19
• Reverted to final-form:4.20.10 and react-final-form:6.5.9
• Overrides were set for both package to use React-19
  And everything seems to work fine. So there seems to be something that changed with the changes in 7.0.0, but haven't had the time to look at the code yet.

[lsapozh]

Same issue on Expo 53/React 19,
had to roll back to the pre-typescript version

[yurii-oliiarnyk-finsight]

@chevvy What solution do you use for this?

• Overrides were set for both package to use React-19

[chevvy]

@chevvy What solution do you use for this?

• Overrides were set for both package to use React-19

in my package.json:

{
  "dependencies": {
    "final-form": "^4.20.10",
    "react-final-form": "^6.5.9",
  },
  "overrides": {
    "react-final-form": {
      "react": "19.0.0"
    },
    "final-form": {
      "react": "19.0.0"
    }
  },
}

as of my comment last week, this still seems to be an adequate workaround, but your millage may vary!

[Dron007]

Too many bugs. In our code I notice them in different places. Some fields are empty. As we have complex dynamic field generation, it is hard to isolate it to provide a minimal example. I think this version should be reverted or fixed ASAP. It was declared as "There should be NO BREAKING CHANGES" but actually it is completely broken.