I noticed on several cards that if the integration (sensor) does not receive data from the device, then instead of a valid last state, the lovelace card’s status shows unavailable (unknown, none, not detected). I understand that the valid status is every detected staus 
Is it my fault due to incorrect settings or is it a property of the “system” and is there any trick to keep the display of the latest status in case there is no update? Examples of integrations: Brother (printer), Garmin, Withings, imap_email_content or any template created for the sensor.