I may have misinterpreted your suggestion but I tried changing Number:Temperature to Number:temperature and received this message:
09:42:15.855 [INFO ] [del.core.internal.ModelRepositoryImpl] - Loading model 'zwave.items'
09:42:15.918 [INFO ] [del.core.internal.ModelRepositoryImpl] - Validation issues found in configuration model 'zwave.items', using it anyway:
'temperature' is not a valid dimension.
According to the item documentation it should include the capitalisation, but again I may have misunderstood.
I define my items textually, but as a test I created the channel through openHAB UI. By default the item is added as Number.Temperature•Point. However, the result is the same.
Interesting that the temperature briefly reported during setup.