It's happened to me plenty of times. If you start out on a divided road heading away from the RLC, but the route eventually goes through the RLC, it will trigger if you are within (currently) 500m, and as you drive away, increase until it gets to 600m. If it doesn't hit 600m, it will then count down until you reach it. If it hits 600m, it will go away and not re-trigger again that I've seen.
How should I mark it? (Solved as a client issue?) The user didn't even follow the path of the Waze given route.
Edit: I only know of one RLC in my travels when I drive between Chico and Sacramento, so my encounters with RLCs are rare.