Absolute Humidity as a Unit of Measure(?)

Just recently (don’t know exactly when) HA has been complaining that one of my MQTT sensors has an invalid config. It suddenly doesn’t like ‘g/m3’ (absolute humidity).

Checking the device class list only relative humidity (%) is listed for a humidity device. But it was working!

Is there a work around?
If not how do I request this be added (reinstated?) please?

Thanks

I think all it wants you to do is remove device_class: humidity for the sensor. It should have no device class.

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One of those ‘Do’h’ moments. Thank you karwosts.