Environment Information

• Package version(s): @fluentui/react 8.0.0.beta.0 (and on....)
• Browser and OS versions: Any

reproduction of the bug :

https://codesandbox.io/s/fluent-modal-on-dialog-forked-p6wso?file=/src/ChoicegroupTest.tsx
same code works fine with 7...... where it fails on 8+

Actual behavior:

updating selectedKey using a useState not setting the radio selection (8.0.0.beta.0 onwards)

Expected behavior:

updating selectedKey using a useState should set the radio selection, worked till 7 (7.177.2)

Priorities and help requested:

Are you willing to submit a PR to fix? Yes

Requested priority: Normal

Products/sites affected: (if applicable)
https:support.xbox.com