Proper way to handle dirtyFields when using useFieldArray?

[sampain]

Hi,

I have a form where I'm using useFieldArray. This form also contain an unrelated input that I have to detect separately if it is dirty or not.
!!dirtyFields.movie is working fine until I click on append (or any of the other buttons) because dirtyFields.movie is now an array with all of its properties. I don't get why useFieldArray is messing with this field.

https://codesandbox.io/p/sandbox/react-hook-form-usefieldarray-forked-hysfn9

I have found an issue about it (#11402), but it doesn't mention what should be done to properly handle that.