Multiple value Entity reference webform field - webform submission 'Submitted to' is empty

When an webform Entity reference field is added to node/entity with 'Unlimited' (or Limited > 1) allowed number of value, webform submissions for all except first webform reference are saved without 'Submitted to' (entity_id and entity_type) values.

This is because of following code in QueryStringWebformSourceEntity() getSourceEntity() method that 'Detect and return a source entity from current context':

On line 156:
if ($source_entity->$webform_field_name->target_id != $webform->id()) {
return NULL;
}

This code gets only target_id of first referenced webform, and in case of multiple referenced webforms, if current webform is e.g. second referenced than this code fails and returns null.