This sounds like a move in the wrong direction for the Renegade. The steel bikes are still claiming 700x42/650x47 on the site. Is the clearance in the rear this the same? For awhile I ran a 35mm tire/45mm fender combo on my '17 Expat with no problems, could have even run a 50mm fender no problem. If anything, you would think Jamis would increase the clearance on the Renegade, especially the carbon models. All of the pictures you see on the bike reviews and bike show coverage sites show a fork that looks to have every bit the clearance as previous models.
I don't know if it is a manufacturing mistake or what. But there definitely is less clearance. The rear is fine. Fits the Same wheel, tire and fender combo from my 2016 Expat frame.