I'm not sure this comment provides any value, but I have never had a warm fuzzy feeling about the in-car trip-planner from the time it was introduced (2016?). There's always been reports of various weird bugs like this, and while it's probably gotten better, I've never felt like I could actually trust it to do the right thing. Also there's no way that the trip planner would know my preferences for when and where to stop. So my normal road-trip procedure is to turn off the trip planner in the car preferences, plan out charging stops in advance, and navigate to each successive charging stop directly.
Bruce.