Doesn’t that make it a bug?
Not really, more a missing feature as the actual dashboard works to design.
It would be nice to have but Home Assistant probably isn’t what you want to be using for energy tracking for more reasons other than the half hour out.
It’s great for automations triggered by energy, the tracking is really just a bonus.
For my own use, I use HA to send my energy data to PVOutput which gives a good view.
iammeter have some good tutorials with copy/paste templates if you want to build your own:
Monitor your solar PV system in Home Assistant - Share your Projects! - Home Assistant Community (home-assistant.io)
Others have set up their own using HA → InfluxDb → Grafana or similar