Nested field arrays are losing state handler methods after dragging

[Skysplit]

What is the current behavior?

In codesandbox:

1. Add section
2. Move newly added section before current one
3. Try to type something in nested item input
4. Error appears

What is the expected behavior?

You can still correctly type in nested field array items

Sandbox Link

https://codesandbox.io/s/final-form-arrays-handlers-error-86wem

What's your environment?

final-form 4.18.7
final-form-arrays 3.0.2
react-final-form 6.3.5
react-final-form-arrays 3.1.1

[vadim-shilov]

https://codesandbox.io/s/react-final-form-field-arrays-add-before-error-43ys7

[damjan25]

any plans to integrate this fix or is there something missing?