Sensor configured with next json:
{"name": "Ping", "icon": "mdi:connection", "expire_after": 30, "state_topic": "homeassistant/light/rv/ping/state", "availability_topic": "homeassistant/light/rv/ping/availability", "command_topic": "homeassistant/light/rv/ping/command"}
But after 30s (and several minutes) after last state update it is still available. Is there any problem in configuration or how to debug it?