Basic c++ pawn w/ associated blueprint link failure during packaging but works in editor

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This is a known issue albeit you’d hope for a little better clarity or warning from the engine.

GEngine not initialized! Problem - Unreal Engine / Programming & Scripting - Unreal Engine Forums

The following code change resolved my issue from the offending class constructor.

SphereComponent->SetMassOverrideInKg(NAME_None, MassInKG);

to

SphereComponent->BodyInstance.MassScale = MassInKG;