NoMethodError: undefined method `key_from_fallback_message_id' for Gitlab::ServiceDeskEmail:Module

https://sentry.gitlab.net/gitlab/gitlabcom/issues/3309212/?referrer=gitlab_plugin

NoMethodError: undefined method `key_from_fallback_message_id' for Gitlab::ServiceDeskEmail:Module
Did you mean?  key_from_address
  lib/gitlab/email/receiver.rb:108:in `block in find_key_from_references'
    key = email_class.key_from_fallback_message_id(mail_id)
  lib/gitlab/email/receiver.rb:107:in `each'
    ensure_references_array(mail.references).find do |mail_id|
  lib/gitlab/email/receiver.rb:107:in `find'
    ensure_references_array(mail.references).find do |mail_id|
  lib/gitlab/email/receiver.rb:107:in `find_key_from_references'
    ensure_references_array(mail.references).find do |mail_id|
  lib/gitlab/email/receiver.rb:86:in `key_from_additional_headers'
    find_key_from_references ||
...
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