Circle of Fortune - Rare item prophecies

Hello fellow COF’ers,

I have a question in regards to rare item prophecies and how it interacts with the Rank 8: Rare to Exalted Chance.

I want to target farm rare items into exalted items because it’s far more efficient in terms of favor to reward. My question is can the items that “upgrade” into an exalted have a t7 modifier on it? How exactly does this interaction work? Does it simply upgrade a random affix to t6, or is there a separate roll that happens to determine if that mod is upgraded further?

I have a small sample size of about 200 rare jewelry from prophecies and have yet to see a t7 affix. If anyone else has tested this or can recollect on their findings via rare item prophecies, that could go a long way in answering these questions.