Importing external project via JSON with issue links ignores/overwrites 'updated' date/time

[M_S_]

I am trying to migrate data from an external project via JSON. Obviously, older records have creation and updated date/time in the past and I would like to keep that history. 

When I import data with the "updated" field set, then everything works fine:

{
 "issueType": "Bug",
 "externalId": "XXX-2",
 "created" : "2012-08-31T17:59:02",
 "updated" : "2012-09-12T15:20:12",
 ...
}

However, when I also create issue links between the imported issues, then all get imported with updated "just now". 

I believe the importer first imports the issues - with updated date/time - then creates the links, which updates/overwrites the date/time. 

Is this a known issue? Is there a workaround for this?

[M_S_ · Accepted solution]

Ok, this turned out to be a false alarm. Issue links import fine, the problem is caused by importing epic links. 

I have created a new question with a corresponding description.