I am seeing this as well on 2021.3.2. If I search for a specific entity it will show the bar for it though, so the data is there.
It seems to have only started when I switched the recorder to use MariaDB yesterday. If I remove the recorder configuration and revert to sqlite the bars return.
I am also seeing this issue. It seems it only occurs when I use the “history:”-option in my configuration to exclude certain domains/entities/entity_globs so that they are not shown in the history. Can someone confirm that the issue disappears when removing the “history:”-section from the configuration?
Same error here, all versions are up to date, running Hass.io on a Pi4, has been perfect for months but now the history is not showing, its still there, i just can’t see it