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