issue: value of double depth arrays lost when one entry is unregistered

[jorrit]

Version Number

7.27.0

Codesandbox/Expo snack

https://codesandbox.io/s/funny-edison-sqdvk9

Steps to reproduce

1. Enter something in name 1, observe that the dumped value changes
2. Check the checkbox. This enables another field.
3. Enter something in name 2, observe that the dumped value changes
4. Uncheck the checkbox. This unregisters the new field.
5. Observe that the dumped value is empty, even though the first field still contains a value.

Expected behaviour

After unregistering items.1.0.name, the value for items.0.0.name should still be in the watched value when watching items.

When I use a single-depth array this works fine (so items.0.name instead of items.0.0.name).

What browsers are you seeing the problem on?

Chrome

Relevant log output

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[jorrit]

This CodeSandbox uses shouldUnregister instead of unregister() with the same effect:

https://codesandbox.io/s/charming-cherry-ptenpl?file=/src/App.tsx