Custom Marker Pathfinding stalls at corners #2629

Description\nCustom Marker Pathfinding can stall almost immediately at the first corner along a route.\n\n## Reported behavior\n- Reproduces with path-recalculation distances of 1, 5, and 300.\n- Alt-clicking a marker location should guide the player to the next waypoint/checkpoint around a corner, but it does not.\n\nThis report was split from #2627 because the marker-persistence portion is tracked by #2626.