This TAC patch isn't working anymore after the latest Common Services Device updates at least in our setup. I have a TAC-case open for that since several weeks, but still no result.

Development has worked with a few customers on this issue, and the moral of the stories has always been make sure the one patch is properly applied, and that all debugging is disabled.

Something else may be wrong in your specific case, and your TAC engineer should be able to provide some additional steps to capture things such as a thread dump from the discovery process.