Steps to reproduce:
1. Download 1122651_repro.zip
2. Build a Standalone player with IL2CPP backend

Results: Player crashes on launch

Reproduced with: 2019.2.0a5, 2019.1.0b2, 2018.3.5f1
Not Reproducible with mono backend

> UnityPlayer.dll!memcpy() Unknown
UnityPlayer.dll!CachedReader::Read(void *,unsigned __int64) Unknown
UnityPlayer.dll!TransferField_NonArray<class StreamedBinaryRead,struct Converter_String>(struct StaticTransferFieldInfo const &,struct RuntimeSerializationCommandInfo &,struct Converter_String &) Unknown
UnityPlayer.dll!ExecuteSerializationCommands<class GenerateTypeTreeTransfer>(struct SerializationCommandProvider &,class GenerateTypeTreeTransfer &,class GeneralMonoObject const &) Unknown
UnityPlayer.dll!Transfer_ManagedObject<StreamedBinaryWrite,0>() Unknown
UnityPlayer.dll!ExecuteSerializationCommands<class GenerateTypeTreeTransfer>(struct SerializationCommandProvider &,class GenerateTypeTreeTransfer &,class GeneralMonoObject const &) Unknown
UnityPlayer.dll!Transfer_ManagedObject<StreamedBinaryWrite,0>() Unknown
UnityPlayer.dll!ExecuteSerializationCommands<class GenerateTypeTreeTransfer>(struct SerializationCommandProvider &,class GenerateTypeTreeTransfer &,class GeneralMonoObject const &) Unknown
UnityPlayer.dll!Transfer_ManagedObject<StreamedBinaryWrite,0>() Unknown
UnityPlayer.dll!ExecuteSerializationCommands<class GenerateTypeTreeTransfer>(struct SerializationCommandProvider &,class GenerateTypeTreeTransfer &,class GeneralMonoObject const &) Unknown
UnityPlayer.dll!Transfer_ManagedObject<StreamedBinaryWrite,0>() Unknown
UnityPlayer.dll!ExecuteSerializationCommands<class GenerateTypeTreeTransfer>(struct SerializationCommandProvider &,class GenerateTypeTreeTransfer &,class GeneralMonoObject const &) Unknown
UnityPlayer.dll!Transfer_ManagedObject<StreamedBinaryWrite,0>() Unknown
UnityPlayer.dll!TransferScriptingObject<class StreamedBinaryRead>(class StreamedBinaryRead &,class ScriptingObjectPtr,class ScriptingClassPtr,struct MonoScriptCache const *) Unknown
UnityPlayer.dll!SerializableManagedRefTransfer::TransferEngineAndMonoInstance<class StreamedBinaryRead>(class Object *,class SerializableManagedRef &,class StreamedBinaryRead &,bool) Unknown
UnityPlayer.dll!SerializedFile::ReadObject(__int64,enum ObjectCreationMode,bool,class TypeTree const * *,bool *,class Object &) Unknown
UnityPlayer.dll!PersistentManager::ReadAndActivateObjectThreaded(int,struct SerializedObjectIdentifier const &,class SerializedFile *,bool,bool,enum PersistentManager::LockFlags) Unknown
UnityPlayer.dll!PersistentManager::LoadFileCompletelyThreaded(class core::basic_string<char,class core::StringStorageDefault<char> > const &,__int64 *,int *,int,enum PersistentManager::LoadFlags,class LoadProgress &,enum PersistentManager::LockFlags) Unknown
UnityPlayer.dll!LoadSceneOperation::Perform(void) Unknown
UnityPlayer.dll!PreloadManager::ProcessSingleOperation(void) Unknown
UnityPlayer.dll!PreloadManager::Run(void) Unknown
UnityPlayer.dll!PreloadManager::Run(void *) Unknown
UnityPlayer.dll!Thread::RunThreadWrapper(void *) Unknown
kernel32.dll!BaseThreadInitThunk() Unknown
ntdll.dll!RtlUserThreadStart() Unknown