Crash during saving - Very large assets

I’m not an experienced user of UE5, I feel this might be a long shot but I need help with a crash when trying to save a map in UE5.

I am importing large assets, originally modelled in Rhino 3d and imported into UE5 using datasmith. There are three datasmith assets, each about 100mb. When I try to save the UE5 map it takes a long time and then crashes. My system specs are decent, 13600k, 128gb ram, RTX 4090.

Crash text here:
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION 0x00007ffa1dab1f01

UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
kernel32
ntdll

Do you have any insight on what might be causing this? Anything I can do to troubleshoot this further?

Thanks
Suresh