I had been running HA for about 2 months with two Nest Doorbell cameras that always worked – they sometimes took a few seconds to load the Lovelace image, but they always worked eventually.
I then added a new wired Nest Floodlight Camera, but the Lovelace image was always black (despite the stream view working).
Then, over the weekend, I had a power outage which corrupted my HA and I learned the lesson of backing things up the hard way. I had to rebuild my stuff from scratch.
This rebuild, presumably, had the unintended benefit of bringing a new version of HA which fixed the Floodlight Camera in Lovelace (and did one better - it’s actually streaming, not just snapshots of images).
The downside, post-rebuild, is that my other two nest doorbell cameras almost never work – it’s not that they take a long time to load, they simply say “Unavailable” (in the lower right corner of the picture-entity card), whereas the Floodlight camera says “Streaming”. Opening either (a) Google Home or (b) Nest app on my android devices shows the streams just fine. It’s just an issue in Lovelace.
Has anyone seen/reported this? No amount of refreshing/restarting HA seems to fix it. Every so often one of the two cameras will show up in lovelace, but it’s the exception, and I haven’t found any rhyme or reason why it works.
-Rick