it may help more to post this question in the IM Gateway Support forum. It may be interesting to know whether Spark sends the new names to Wildfire, but Daniel “jadestorm” will likely not look in this forum.
I can’'t see such a problem using Spark and Wildfire so I assume you see this problem just with the transports. It may be of course a good idea to specify the Spark and Wildfire version but in your case it seems to be just a transport issue - and the transports are still beta.