CheckboxGroup form reset unchecks only one box again (regression of #7749)

[alexandru-bereghici-to]

Provide a general summary of the issue here

Regression of #7749 (fixed in #8316): a form reset on a CheckboxGroup unchecks only one of several checked boxes.

🤔 Expected Behavior?

form.reset() restores the group's default value: every checkbox the user checked is unchecked at once, as with native <input type="checkbox">.

😯 Current Behavior

Observed in headless Chromium (Playwright), react-aria-components 1.20.0 / react-aria 3.51.0 / react-stately 3.49.0, React 19.2.7. Check "a" and "b" in a group with no default, then call form.reset():

setup	before reset	after reset
RAC CheckboxGroup + RAC Checkbox	[a, b]	[a] ❌
RAC CheckboxGroup + useCheckboxGroupItem	[a, b]	[a] ❌

💁 Possible Solution

Each checkbox registers its own reset listener, which calls its toggle state's setSelected(default); its onChange then calls state.removeValue(value) on the group. Several removals in the same reset appear to read the same group value, so only one survives. Resetting the group's value once (e.g. state.setValue(state.defaultValue) from a group-level listener) restores every box; that is what we use as a workaround.

🔦 Context

Found while migrating a design-system CheckboxGroup to react-aria. #8316 fixed this for 1.x in 2025; it fails again in 1.20.0.

🖥️ Steps to Reproduce

import { CheckboxGroup, Checkbox } from "react-aria-components";

export function Repro() {
  return (
    <form>
      <CheckboxGroup aria-label="Letters" name="letters">
        <Checkbox value="a">a</Checkbox>
        <Checkbox value="b">b</Checkbox>
        <Checkbox value="c">c</Checkbox>
      </CheckboxGroup>
      <button type="reset">Reset</button>
    </form>
  );
}
// Check a and b, press Reset → a stays checked.

Version

react-aria-components 1.20.0, react-aria 3.51.0, react-stately 3.49.0

What browsers are you seeing the problem on?

Chrome

If other, please specify.

No response

What operating system are you using?

macOS

🧢 Your Company/Team

No response

🕷 Tracking Issue

No response