Change Tracking in SQL 2012 - Behavior Change

Hi,
We observed some change in behavior for Change Tracking feature in SQL 2012 Express. Sequence is as follows,
CT is not enabled at DB level. (Of course at table level too)
Created and populated table CTTEST with some rows, say 10 rows
Enabled CT at DB level
Enable CT for table CTTEST
Queried change tracking data, using change table function (select CT.* from CHANGETABLE(changes CTTEST, 0) CT). No rows returned. Perfect.
Updated few existing rows
Queried change tracking data using CHANGETABLE function as above. Now it returns the modified records. But SYS_CHANGE_OPERATION column shows as 'U', indicating update. Same scenario was tested in SQL 2008 Express, and we got SYS_CHANGE_OPERATION column
as 'I', indicating as Insert. 
Is this a change in behavior? Can somebody clarify this?
Note: SQL Version is, "Microsoft SQL Server 2012 - 11.0.2100.60 (X64) Express Edition  (Build 7601: Service Pack 1)"

Please note that I am not talking about CDC, but CT - Change Tracking and that too in Express edition. 
Yes, I know, when we update primary key value, we will get a delete and insert transactions in CT. But my scenario is different. I am updating the rows, which are already available prior to enabling Change Tracking in that table. In that case only, I am
observing this. 

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