[Breaking Changes]
Usages of customTypeSerializer PrototypeIdListSerializer have been replaced with ProtoId. Usage of existing fields may need to be changed if for some reason you were also using a list of strings instead of ProtoId.
Of note, IBiomeWorldLayer now uses ProtoId and ProtoId and IBiomeWorldLayer uses ProtoId for their property types. Existing implementations of either will need to be updated to match the new type.