Contact module recipent field raising issue on ajax fields for Module contact_mail_formatter

Why is it necessary to change Drupal core here rather than have your module respond to getRecipients with an array?

@cilefen Thanks for your reply.
As in the contact module used the implode method, when fresh from load it gives an array, but when form rebuilds it gets data from the direct field which is strig that why my Ajax call was broken, if we can add there a check for array it will resolve Issue .

if there is any other solution that I can use to solve my problem, Please help

@Jitendra verma, this is now a support request and the Drupal Core issue queue is not the ideal place for support requests. The 'support request' option is there for filing support issues for contributed modules and themes. There are several support options listed on our support page → (Community > Support at the top of Drupal.org) and there is Drupal Slack → . You may get better replies in one of those places.