While each case must be judged for itself I once heard the following. Normally when a yud is touching a vav or zion and could possibly turn the ois into a "ches" is more of a problem then a case of a yud touching a long Nun. The fact the the regel is so long, doesn't begin to go into the sofek of looking like a Ches.
Do any achronim or seforim speak about this case (in a general ofen. Like I said of course difficult to say an exact clal since every case is different.)