Swimlane does not work in multi instance sub process

I have added a multi instance sub process on to the swim lane and there is one human task in that sub process, please see the attachment of the snippet of my process diagram.

Problem: When the multi instance sub process is re-entered second time then the new human task which gets created as part of sub process instance is not getting assigned to the same earlier actor. The new task is in ready state and not assigned to anyone.

Expected Result I am expecting that for every new reentry of sub process instance it should remember the previous actor and assign the human tasks of the re-entrant process instance according to the previous actor.

To elaborate more on this, Lets say I have a list of sub offices (sub-office-1, sub-office-2) which is an input to the multi instance sub process. Now there will be 2 sub processes created, each one has a human task created(Sub PA review in my example). During the first pass the tasks will be claimed by different users and completed. Now when the sub process instances are re created second time with the same input (sub-office-1, sub-office-2) the human tasks of those sub process should be assigned to the same previous actors of first pass.

There is a discussion thread on this issue and I was asked to create a ticket