I have the same problem as @The-Elk with that gear. After restarting the openhab the “Device protocol” setting is back to default. No storing of the manual change of the device protocol in in openhab.
I my case, when I switch OFF the device with the LD382A protocol setting the WW switches permanent ON (100 %) and the only way switch it OFF again, is the use native app (Magic Home).
I have two of those and one is in the sleeping room and it is really annoying when I have forgotten to change it again after restarting openhab…
Regarding @SpaceGlider’s problem, I had it too. With that native App device type setting:
With the FADING program I use the default values for program speed. It works to me - the light is fading. I’ve not tried to change the values, so I cannot tell if they are accessible from a functional perspective. In the GUI it seems to be changeable.