Ensure Comm Preferences esp OptOut can be seen and options set in Merge contacts

Under Merge Contacts seems to be no options in terms of Comms Preference - a key one of course being Opt Out.

Scenario. Contact A and B are same person. Contact A has been getting lots of emails, then Opts Out. Then a merge occurs, merging A to B - so A (who is now B) starts getting emails again.