Microsoft has a pretty embarrassing problem on its hands, and it is affecting a number of users in the Windows Insider program. Microsoft has several “rings” that it uses to distribute test builds of Windows 10 to Insiders. Slow, Fast, and Skip Ahead builds escalate in their instability, but offer users a way to test out upcoming features

Source: Hot Hardware – Windows 10 20H1 Internal Build Accidentally Pushed By Microsoft To All Insiders