Mqtt extract data on same topic

[Troon]

Something must be happening on the MQTT bus to cause this. You need to watch the messages on your MQTT server to see what is going on.

This topic may help: seems like a similar issue:

"unavailable" in the states table fakes out lovelace UI

I have a device that is on a battery, so it sleeps most of the time. This (I think) leads to a peculiarity when graphing values in the lovelace UI. I am using Home Assistant 2021.6.4, but I have been seeing this since I started using HA about a year ago. [Screenshot at 2021-06-20 17-39-10] I have several small esp8266 or esp32 boards scattered around my house. All have a BME280 sensor (temperature, relative humidity, air pressure). All are programmed with ESPhome but are configured to send da…