I may not have been clear, but part of what I meant by "working" was that the device was parsing and generating the events as expected:
I'm not sure where your question with Dashboard fits into this; if you are using an "Attribute" tile to, for some reason, display supportedFanSpeeds, then it should pull that from the device page--and match what shows there. More likely, I suspect you have a "Fan" tile and are expecting the popup to show only the speeds indicated by this attribute. I asked about this above, and that is (currently?) not something Dashboard does, which again just shows all the standard attributes regardless; see my original post, post 3, and the staff replies to both.
This attribute is new, and perhaps more apps will take advantage of it going forward. But the lack of use is a separate issue from the event not getting generated at all. 
I don't seem to have run into any problems there. If I'm missing something else, let me know and I can test what we are able to! This should be nearly anything (we don't need access to the source to tell when an event is generated, for example).
