Set read only when updating existing profile with link to contact.

uw_ct_profile.module

@@ -21,7 +21,8 @@ function uw_ct_profile_form_node_uw_ct_profile_form_alter(&$form, FormStateInter
 
   // Apply readonly to fields only when link with contact field has contact
   // entity referenced.
-  if (!empty($form_state->getValue('field_uw_ct_profile_contact')[0]['target_id'])) {
+  if (!empty($form_state->getValue('field_uw_ct_profile_contact')[0]['target_id']) ||
+  !empty($form['field_uw_ct_profile_contact']['widget'][0]['target_id']['#default_value'])) {
     foreach (_uw_ct_profile_alter_fields() as $profile_field => $contact_field) {
       $form[$profile_field]['widget'][0]['value']['#attributes']['readonly'] = 'readonly';
     }