Classifying Email Inbound Management tickets as Junk or Blacklist does not close associated Incident Management ticket SD 7.6

Hi,

I am observing in Service Manager MyTask list there are some EM***** tasks are there which I cannot clasify when I try to classify it gives error I have seen this 

https://support.symantec.com/en_US/article.TECH213...

Article but its for 7.5 Sp1 and I am using 7.6 version I thought It was fixed but still I am facing issue can anyone guide me how to resolve or there is any fix for this issue

regards