I noticed this issue when using the maps last night. I wanted to go to the In-N-Out at 6015 Johnson Drive, Pleasanton CA. No matter where I was, the app refused to route over the segment of Hopyard at I-580 (which would have been the more direct route). Instead, I was asked to re-route back onto the interstate for one exit and then backtrack to the area using side roads.
I could not find any issue with that segment, i.e. it is marked as a primary road and would not have incurred a penalty for traveling over it.
I apologize for not including a permalink of the directions as I am not sure how to create one on the page.
Example of issue
Starting address: Houston Pl, Dublin, CA 94568
Destination: 6015 Johnson Drive, Pleasanton CA