Microsoft has accidentally released internal Windows 10 Build 18947 to all channels of the Windows Insider program. The build is believed to be available on both 64-bit and 32-bit PCs. Microsoft’s Dona Sarkar revealed that the company is looking into this issue. Users who have been receiving this internal build have seen it titled as “Windows 10 Insider Preview 18947.1000 (rs_prerelease)””. Some users have also reported receiving the internal build with a title of “”189471000.rs_xbox.190723-1357 (UUP-CTv2)”
Source: https://www.bleepingcomputer.com/news/microsoft/internal-windows-10-build-18947-pushed-to-all-insiders-by-mistake/