ChoiceGroup checked option is not reflected in the input markup

[onlyann]

Environment Information

• Package version(s): 7.110.4

Please provide a reproduction of the bug in a codepen:

The ChoiceGroup basic sample exhibits the issue:
https://codepen.io/onlyann/pen/GRpxrLw

Actual behavior:

Whenever a different option is selected, the initially selected `option remains checked

<input id="ChoiceGroup1-B" class="ms-ChoiceField-input input-48" type="radio" name="ChoiceGroup1" required="" checked="">

whereas the newly selected option is not marked as checked

This doesn't impact the selected option in React.

Expected behavior:

The checked attribute should reflect the currently selected option.

Priorities and help requested:

Are you willing to submit a PR to fix? Yes (if I can identify the root cause)

Requested priority: Low

[onlyann]

After more research, it looks like this is not an issue with fluent-ui.
React is not necessarily syncing DOM attributes and properties and there is even an attempt through facebook/react#11896 to stop syncing value too.