NullableBooleanInput defaultValue not working

[wmwart]

What you were expecting:
Expected to be able to set a default value for the fields as stated in the documentation

What happened instead:
This does not work

Steps to reproduce:

1. Set the default as in the documentation
2. No reaction

Related code:

<NullableBooleanInput source="commentable" defaultValue={true} />
<NullableBooleanInput source="commentable" defaultValue={false} />
<NullableBooleanInput source="commentable" defaultValue={null} />

https://codesandbox.io/s/old-firefly-879dr?file=/src/posts/PostCreate.tsx:2648-2713

Other information:
In the codesandbox example, there was some kind of crutch passing the defaultValue for BooleanInput. does not look like in the documentation
https://marmelab.com/react-admin/CreateEdit.html#per-input-default-value

Environment

• React-admin version: 3.13.1

[djhi]

Reproduced. Thanks for the report!