Zigbee (ZHA) thermometers integration with Google Home

HI, I have recently set up a few Zigbee temp/humidity devices. They are working well in Home Assistant.
I have tried exposing the entities (temp, humidity) to Google Home via the Nabu Casa integration. Humidity shows up as a xx% and looks good - however temperature doesn’t show anything - and if you select it in Google Home it just opens the device settings screen - correctly noting that it’s a temp sensor. Trying to work out why humidity would work ok but not temperature.
If anyone has any experience with this, some help would be appreciated. Thanks!