c# - Serialized nested list corrupt at editor reboot (Unity3D) -

i trying serialize scriptable object contains dictionary plan use build levels game. after object created , initialized, save asset attached monobehavior generates level dynamically. since unity can't serialize dictionaries using lists in conjunction iserializationcallbackreceiver interface, save , load data contained in dictionary. scriptable object code

public class levelsdatabase : scriptableobject, iserializationcallbackreceiver {     public dictionary<roombiome, dictionary<roomtype, levelinfolistwrapper>> biomedictionaries =         new dictionary<roombiome, dictionary<roomtype, levelinfolistwrapper>>();      // serialization variables     [serializefield]     private list<roombiome> _biomedictionarieskeys = new list<roombiome>();     [serializefield]     private list<roomtype> _levelinfolistkeys = new list<roomtype>();     [serializefield]     private list<levelinfolistwrapper> _levelinfolistvalues = new list<levelinfolistwrapper>();      public void generatelevelsdatabase()     {         debug.log("generated database");         loadlevelinfo();     }      // database generation code      public void onbeforeserialize()     {         try         {             _biomedictionarieskeys.clear();             _levelinfolistkeys.clear();             _levelinfolistvalues.clear();              foreach (var biomedictionary in biomedictionaries)             {                 _biomedictionarieskeys.add(biomedictionary.key);             }              var key = _biomedictionarieskeys[0];             foreach (var roomtypedictionary in biomedictionaries[key])             {                 _levelinfolistkeys.add(roomtypedictionary.key);             }              foreach (var biomekey in _biomedictionarieskeys)             {                 foreach (var roomtypekey in _levelinfolistkeys)                 {                     var biomedictionary = biomedictionaries[biomekey];                     if (!biomedictionary.containskey(roomtypekey))                     {                         continue;                     }                     var levelinfolist = biomedictionaries[biomekey][roomtypekey];                     _levelinfolistvalues.add(levelinfolist);                 }             }         }         catch (exception e)         {             debug.log("something horrible happened");         }     }      public void onafterdeserialize()     {         biomedictionaries.clear();         int index = 0;         foreach (var biomekey in _biomedictionarieskeys)         {             biomedictionaries.add(biomekey, new dictionary<roomtype, levelinfolistwrapper>());             foreach (var roomtype in _levelinfolistkeys)             {                 if (index >= _levelinfolistvalues.count)                 {                     break;                  }                  // todo quick fix, replace when refactoring                 if (roomtype != _levelinfolistvalues[index].levelinfolist[0].roomtype)                 {                     continue;                 }                  biomedictionaries[biomekey].add(roomtype, _levelinfolistvalues[index]);                 index ++;             }         }         debug.log("deserialized");     } 

roombiome , roomtype enums , levelinfolistwrapper wrapper list of levelinfo objects defined following:

[serializable] public class levelinfolistwrapper {     public list<levelinfo> levelinfolist = new list<levelinfo>(); } 

levelinfo scriptable object contains data belonging rooms used in level. defined

    [serializable] public class levelinfo : scriptableobject {     public roomtype roomtype;     public roombiome roombiome;     public levelsenum level;      [serializefield]     private list<entrypoint> _levelentrypoints = new list<entrypoint>();     //todo add breakable spawners , combat triggers info     public void addentrypoints(ilist<entrypoint> entrypoints)     {         _levelentrypoints.addrange(entrypoints);     }      public list<entrypoint> getentrypoints()     {         return _levelentrypoints;     } } 

levelinfo has, among data list of entrypoints defined such:

[serializable] public class entrypoint {     public string tolevel;     public roombiome tobiome;     public vector3 position;     public int index;     public entrypointposition positioninroom; } 

this code works , serialization/deserialization process handled correctly when play , stop editor. unfortunately if quit editor , restart it, lists list < levelinfo > contained in _levelinfolistvalues not correctly deserialized , contain levelinfo references initialized default constructor. have read few posts , references running out of ideas on how make unity serialize correctly list of levelinfowrapper. idea ditch unity's serialization , use somenthing xml or json tempting before resorting wondering if has suggestion possible solution. thanks!