In some scenarios when copying the shared crash context the engine would overrun the fixed size string buffer. This issue appeared after two ensures fired, since the dynamic string buffers lifetime was equal to the crash reporting thread, and only reset on initialization.
#jira UE-89180
#rb pj.kack
#ushell-cherrypick of 11586607 by Johan.Berg
[CL 11601293 by Johan Berg in 4.25 branch]