The one-way barrier update definitely introduced the LDL bug you are experiencing. It changed how "closed" polygons (where the start pt = end pt) were treated and causes the weird diagonal line. With LDL, the only way to get rid of this seems to be only using "open" polygons on your DL layer, where the start does not connect to the end. I wrote a script to easily convert closed polygons to open ones, but this would require a pro subscription. For free/plus users, you'll have to either re-draw these DL features or use UDL, unless a fix is implemented (not likely, due to LDL sunsetting). It's a pain, for sure.