Recipient limit configuration ignored

The recipient limit configuration ignored by the module, the default value (50) is set always regardless of what is being set on the /admin/config/mass-contact/settings form for the "Maximum number of recipients before splitting up the email" field.

The only reference I've found for the limit is in the \Drupal\mass_contact\MassContact::getGroupedRecipients() method.
The code only checks for the default "MAX_QUEUE_RECIPIENTS" and doesn't use the configured "recipient_limit".