UAT crashing at end of build calling FScopedSceneLock_Chaos::LockScene()

UAT has intermittent crashes at the end of  packaging. Looks related to 

[Link Removed] . Could be that the solver is being destructed after the null check earlier in the function if this is multithreaded?

The following cases all have the same issue. 

https://forums.unrealengine.com/t/packaging-fails-with-substepping-enabled/1994988/3

https://udn.unrealengine.com/s/question/0D5QP00000hVAAq0AO

https://udn.unrealengine.com/s/question/0D5QP00000ehQi80AE

Building the project as per the tickets

[UE-23848] Bug Status

LS-0019-IS-PQR23 on the start of running UE4

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