Most likely this will not be considered a "bug", but a "normal feature" of the Nav software that they have chosen to use.
But, it does not hurt to report the things you do not like.
Most annoying about the Prius Nav database is that not all areas are "fully covered". Apparently their adopted Nav system (gets data from a dual-layer DVD) ran out of room (about 7.5 GB) and they had to strip out data in some less-populated areas. Other GPS systems compress/organize/store data much more compactly, and appear to cover all of the USA and Canada in less than 2 GB of flash memory (SD card).
Does the LEAF Nav have "full" coverage, or just partial?