fix(Core/Movement): correct weird pathing by clearing old path (#7034)

- Closes #5220.

src/server/game/Movement/MovementGenerators/PathGenerator.h

@@ -111,6 +111,12 @@ class PathGenerator
             return len;
         }
 
+        void Clear()
+        {
+            _polyLength = 0;
+            _pathPoints.clear();
+        }
+
     private:
         dtPolyRef _pathPolyRefs[MAX_PATH_LENGTH];   // array of detour polygon references
         uint32 _polyLength;                         // number of polygons in the path
@@ -139,12 +145,6 @@ class PathGenerator
         void SetActualEndPosition(G3D::Vector3 const& point) { _actualEndPosition = point; }
         void NormalizePath();
 
-        void Clear()
-        {
-            _polyLength = 0;
-            _pathPoints.clear();
-        }
-
         bool InRange(G3D::Vector3 const& p1, G3D::Vector3 const& p2, float r, float h) const;
         float Dist3DSqr(G3D::Vector3 const& p1, G3D::Vector3 const& p2) const;
         bool InRangeYZX(float const* v1, float const* v2, float r, float h) const;

src/server/game/Movement/MovementGenerators/TargetedMovementGenerator.cpp

@@ -131,6 +131,8 @@ bool ChaseMovementGenerator<T>::DoUpdate(T* owner, uint32 time_diff)
 
     if (!i_path || moveToward != _movingTowards)
         i_path = std::make_unique<PathGenerator>(owner);
+    else
+        i_path->Clear();
 
     float x, y, z;
     bool shortenPath;