Users project crashes when opening level that loads multiple sub-levels. Unable to reproduce this in a clean project so the users project is provided though Epic's box account (link is in the repro steps).

Regression: Possible. User claims this crash didn't occur in the same project in 4.15.

Crash Reporter: [Link Removed]

User Description:

Our problem is simple enough: We've updated to 4.16, and we can't load our main (and big) levels that contains a lot of sub-levels for streaming (it crashes instantly at 0%), but we can load every single sub-level separately without problem. It worked fine in 4.15.

We've played around with the problem, and the error seems to be happening when we try to load a level with 30-ish sub-levels, but I don't think it's related to the number of sub-levels, since we created a test project and added 128 empty sub-levels and everything worked fine. Basically I can't find a way to reproduce the error in an empty project. It looks like we have something too big that busts some buffer, but it worked fine in 4.15.

Steps to Reproduce
  1. Unzip the project from: [Link Removed]
  2. Open the project
  3. Go to the maps folder > Open the "FirstPersonExampleMap" (the only map without a number)

Results: The project will immediately crash

Expected: For the level and all sub-levels contained to open without error

Assertion failed: Ar.Tell() < MAX_SUMMARY_SIZE / 2 [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\AsyncLoading.cpp] [Line: 6783]

UE4Editor_CoreUObject!FArchiveAsync2::ReadCallback() asyncloading.cpp:6783 
UE4Editor_Core!IAsyncReadRequest::SetComplete() asyncfilehandle.h:157 
UE4Editor_Core!FAsyncTask<FGenericReadRequestWorker>::DoWork() asyncwork.h:264 
UE4Editor_Core!FAsyncTask<FGenericReadRequestWorker>::DoThreadedWork() asyncwork.h:288 
UE4Editor_Core!FQueuedThread::Run() threadingbase.cpp:442 
UE4Editor_Core!FRunnableThreadWin::Run() windowsrunnablethread.cpp:76 

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ComponentUE - Foundation - Core - UObject
Affects Versions4.164.17
Target Fix4.17
Fix Commit3524194
Main Commit3492074
Release Commit3530680
CreatedMay 31, 2017
ResolvedJul 6, 2017
UpdatedApr 27, 2018
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