Forum Discussion
No firm answer in here I'm afraid. I saw you post this previously, thought it sounded wrong and assumed you weren't doing something correctly. So I did some tests and concluded exactly the same as you.
I have successfully used device migration previously, both with Cyclone IV and V (not that package), without issue. I'm pretty sure I'd have checked the power pins, as you have. I assume (I cannot recall) that I didn't find any inconsistencies.
There are plenty of devices (Intel and beyond) that share power pins internally such that both A4 & A9 would work correctly. However, I'm not in a position to confirm this either way for this device.
I suggest you raise a ticket via MyIntel
https://www.intel.com/content/www/us/en/my-intel/sign-in.html
Cheers,
Alex