Fix editor link validation regressions

tests/ReactorMaintenance.Simulation.Tests/SimulationEngineTests.cs

@@ -558,6 +558,10 @@ public sealed class SimulationEngineTests
             level = AddLine(level, ECarrierType.Electricity, new(2, 2), new(3, 2));
             level = level.SetProp(new(2, 2), new() { Type = EPropType.Flow, Carrier = ECarrierType.Electricity });
         }
+        else
+        {
+            level = level.SetUnderground(new(3, 2), ECarrierType.Electricity, new() { State = EUndergroundState.Intact });
+        }
 
         return level.SetProp(new(3, 2), new() { Type = EPropType.Door, DoorState = EDoorState.Closed });
     }