GetSpaceInfo adds NVRAM_READ_AUTHORIZATION/NVRAM_WRITE_AUTHORIZATION twice to the set of attributes if TPMA_NV_AUTHREAD/TPMA_NV_AUTHWRITE bits are set for the defined space.
The reason is that they are added both in MapAttributesFromTpm() and in GetSpaceInfo() itself, if world_read_allowed/world_write_allowed are set.