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Unknown Known Entity
(lemmy.tf)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Maybe click on that lux entity in the dashboard and see if it has been consistently transmitting its data (on the history graph)? I'm pretty sure you'll get this warning if the state reads "unavailable" which could be a reception issue or a dying sensor.
I recently saw this happen to an animation of mine and I think this was the cause