Problem with initialValues, FieldArray and unshift

Hi.

I have a form with some initial values. I use FieldArray to render. If i use push to add empty entries, everything works just fine. But if I use unshift (and I want to insert at top), form is completely broken.

I have managed to trim down my problem to this sandbox:

https://codesandbox.io/s/react-typescript-343gf

In that sandbox, you can toggle any checkbox and remove/add new entries.

Go ahead and change row 70 from

push("sla", undefined);

to

unshift("sla", undefined);

Once you click on "Create new" now, the form is broken. The new item is checked (should be unchecked), and you cannot toggle any checkboxes...

Is this a bug, or am I not seeing the obvious error in my code?