Windows 10 Insider Preview Build 19033 (20H1) released to
BOTH the Fast and Slow ring:
Announcing Windows 10 Insider Preview Build 19033 | Windows Experience Blog.
NOTE: We are looking to begin releasing new builds from our development branch. This means we will be releasing builds to Insiders in the Fast ring from the RS_PRERELEASE development branch again instead of the VB_RELEASE branch. This also means the desktop watermark will be returning with these builds. As is normal with pre-release builds, these builds may contain bugs and be less stable. Now is the time to check your Windows Insider Settings and switch to the Slow ring before if you wish to remain on 20H1.
For Insiders in the Fast ring who have selected to stop getting Insider Preview builds when the next major release of Windows 10 is available under Windows Insider Settings, we will be moving you to the Slow ring as part of honoring this setting. You will remain here until 20H1 is finalized. This only applies to Insiders in the Fast ring who selected this.
See the blog post for the changes, improvements, and fixes.