Control status does not update in validate NG_VALIDATORS

I want to do something when the control status changes. I am using NG_VALUE_ACCESSOR and NG_VALIDATORS. The validate function gets the control but the values don't seem to change.

Sample code https://stackblitz.com/edit/angular-custom-formcontrols-oqmwqg

Line 50 never happens in json-input component.

I want the action to happen in the component, not outside. If you make the textarea empty, the control is invalid but status in validate never updates.

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