In short, the trick storing a pointer to the packed index of the primitive does not work as it is simply a pointer into the same object as
the cached primitive already stored. If the object pointer is invalid, the index pointer will also be invalid.

Steps to Reproduce

See UDN post.

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ComponentUE - Platform - XR
Affects Versions4.19
Target Fix4.22
Fix Commit4997160
Main Commit4997162
Release Commit4997160
CreatedJan 7, 2019
ResolvedFeb 14, 2019
UpdatedAug 14, 2019