Core/Pets: Fix stay command if pet is currently processing spline movement

src/server/game/Entities/Unit/Unit.cpp

@@ -17400,7 +17400,11 @@ bool CharmInfo::IsCommandAttack()
 
 void CharmInfo::SaveStayPosition()
 {
-    m_unit->GetPosition(m_stayX, m_stayY, m_stayZ);
+    //! At this point a new spline destination is enabled because of Unit::StopMoving()
+    G3D::Vector3 const stayPos = m_unit->movespline->FinalDestination();
+    m_stayX = stayPos.x;
+    m_stayY = stayPos.y;
+    m_stayZ = stayPos.z;
 }
 
 void CharmInfo::GetStayPosition(float &x, float &y, float &z)