This will not work with those items since the API reports the state with the unit already appended (in other terms, it will fail formatting 17.7 °C with the "%.1f °C" pattern since it’s not recognized as a number). If you uncheck the option it will display them as-is which is in this case incidentally what you want in the first place.
HABPanel has no support whatsoever for QuantityTypes…
then i would suggest to use proxy/dummy items as a work-round till a updated version of HABpanel is availbe
in the same thread, that i posted, is written how to do this