Feedback node bug when upgrading to LabVIEW8.6.0?

I'm using LabVIEW to develop a DSP (Digital Signal Processing) application, when upgrading my code from LabVIEW8.2.1 to LabVIEW8.6.0, some functions working properly in LabVIEW8.2.1 now give incorrect result after being upgraded to LabVIEW8.6.0. After debugging, I found that the feedback node in LabVIEW8.6.0 introduces abnormal Data Type Conversion, I solved it by replace the feedback node with a shift register, is this a bug?
Here I attach screen shots of one of my VIs, in this VI I'm using feedback node to implement point-by-point digital filtering on input complex data, attached file"Code_LV82.PNG" shows its diagram in LabVIEW8.2.1, if I open the same VI in LabVIEW8.6.0, the initial terminal of feedback node is now visible and there are 2 extra auto Data Type Conversion (shown as red dots) at output branches of feedback node (in attached file "Code_LV86_Marked.PNG", refer to where the 2 blue arrows point to), and this VI functions improperly. In LabVIEW8.6.0 if I replace the feedback node with a shift register or give a constant "0+0i" to the initial terminal of feedback node, the 2 extra auto Data Type Conversion are gone and everything is ok.
Here I also attach my VI (as attached "wt_2nd Order Low Pass Filter.vi " ), you can try if my problem could be replicated.
Any suggestion is welcome, thanks in advance.
Attachments:
Code_LV82.PNG ‏27 KB
Code_LV86_Marked.PNG ‏20 KB
wt_2nd Order Low Pass Filter.vi ‏10 KB

Hi,
you can do the necassary changes in business and develop the BBP from Functional point of view and capture the same in change request for transport.
For further information go to this link.
https://www.sdn.sap.com/irj/scn/wiki?path=/display/erp6/
https://www.sdn.sap.com/irj/scn/wiki?path=/display/erp6/transactionsChangedinECC6.0
BT
Satish

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