Folk Catacombs zones with stairwell teleporters fail to build

My friend encountered it twice in a row, might be consistent?
Executing builder 'CatacombsPublicus' for Zone 'JoppaWorld.53.3.2.0.11': System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
  at System.Collections.Generic.List`1[T].get_Item (System.Int32 index) [0x00009] in <605bf8b31fcb444b85176da963870aa7>:0 
  at XRL.World.ZoneBuilders.ZoneBuilderSandbox.EnsureCellReachable (XRL.World.Zone zone, XRL.World.Cell cell) [0x000b7] in <d3895e700ecf4c5aa828a69aaf6506f3>:0 
  at XRL.World.ZoneBuilders.CatacombsPublicus.BuildZone (XRL.World.Zone Z) [0x008b0] in <d3895e700ecf4c5aa828a69aaf6506f3>:0 
  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <605bf8b31fcb444b85176da963870aa7>:0 
   --- End of inner exception stack trace ---
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00083] in <605bf8b31fcb444b85176da963870aa7>:0 
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <605bf8b31fcb444b85176da963870aa7>:0 
  at XRL.World.ZoneBuilderBlueprint.ApplyTo (XRL.World.Zone Zone) [0x000b7] in <d3895e700ecf4c5aa828a69aaf6506f3>:0
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