Adding extraTemp field shows invalid observation, then 78undefined once websocket updates.

[dersgniw]

I'm using the ecowitt gw1000 driver and have a sensor coming across as extraTemp9. The driver is adding this to the group_temperature group.

I set my config to include extraTemp9 -
station_observations = "barometer","dewpoint","outHumidity","rainWithRainRate","extraTemp9"

And, added a label
[[[Labels]]]
[[[[Generic]]]]
extraTemp9 = Water Temp

When I refresh my browser, this shows as:

Water Temp - Invalid observation.

After the websocket pulls in the latest data, it shows Water Temp 78.3 °F. If I had just restarted weewx, this actually show Water Temp 78.3undefined. Many minutes later, the degrees is figured out.

Any ideas of what I need to do here?