fix: add created solution to model

src/solvers/scip.rs

@@ -160,6 +160,7 @@ impl WithInitialSolution for SCIPProblem {
         for (var, val) in solution {
             sol.set_val(Rc::clone(&self.id_for_var[&var]), val);
         }
+        self.model.add_sol(sol);
         self
     }
 }