Question when using isValid triggering all field validations when reValidateMode is set to onBlur

[Gartok]

Hi,

When I set reValidateMode to "onBlur", the validate function for all fields is triggered every time I blur any single field.

For example:
1. I enter a value in the “First Name” field, Email field, Last Name field and blur it.
2. The validate function for First Name, Last Name, and Email all get triggered when I will blur Email field, instead of just validating the field I blurred.

This behavior causes unnecessary validation calls for fields that haven’t even been interacted with yet, which is especially problematic when there are expensive operations like API calls inside validate (e.g., in lastName).

Expected Behavior

I would expect only the validation function of the field that was blurred to be triggered.

Question
• Is this the intended behavior of reValidateMode: "onBlur" in React Hook Form?
• If not, is there a way to limit validation to only the field that is being blurred?
• If this behavior is expected, what is the recommended approach to validate only one field at a time on blur, without triggering validations for other fields?

See exemple here : https://codesandbox.io/p/sandbox/react-hook-form-v7-ts-template-4tn8i

Thanks for your help!
Nicolas