Korean reports point out to the existence of 8-core/16-thread Ryzen 5 1600/1600X CPUs. Benchmark results indicate that these CPUs are essentially US$200 Ryzen 7 1800X variants.
https://www.notebookcheck.net/8-core-AMD-Ryzen-5-1600-X-CPUs-randomly-surface-performance-matches-the-more-expensive-Ryzen-7-1800X.256080.0.html
So there are some cases of Ryzen 6 processors having 8 cores & 16 threads activated rather than the normal specced 6 cores & 12 threads. This must be an error on behalf of the supplier, because I would have thought it would be illegal to just increase the number of cores on an existing product - it's not the correct specification of the product that the consumer expected to buy. This is an error on behalf of the supplier right, they couldn't have wanted to have put 8 active cores into these Ryzen 6 CPUs?