Disclaimer: not sure if this is a problem or intended behaviour but at least I think this can get some improvements.
I use a history graph card to show the state of some appliances during the day.
A first problem I saw is that sometimes these bars show as white/transparant, no state. When I refresh the colors and states get loaded. It seems like the colors didn’t load.
A second problem I saw is that when a state didn’t change in the timeframe defined by “hours to show” the bar is also white. See this example.
First I have 23 hours to show → no state + white bar.
Then I show 24 hours → state + color
In the first case it would be lovely it did show the previous state. Although thats probably not available.
Or at least show the track of the bar.
I’m a frontend developer and now to Home Assistant. If someone could point me in the direction where I can contribute to this that would also be great.