Arm64 package error - MallocBinned2.cpp

I am trying to package for arm64 but get the error:

LogPlayLevel: Error: 08-12 17:13:55.367 22439 22439 D UE4 : Fatal error: [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Core/Private/HAL/MallocBinned2.cpp] [Line: 1228]
LogPlayLevel: 08-12 17:13:55.367 22439 22439 D UE4 : FMallocBinned2 Attempt to realloc an unrecognized block 0x7a79880000 canary == 0x0 != 0xe3

the package for arm7 works fine. Anyone know what the issue might be / how to fix it? Of course Oculus only accepts arm64 now so I am in a bind

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