https://wccftech.com/beta-insiders-are-receiving-new-dev-channel-windows-11-build-22581/

Microsoft is today releasing Windows 11 Insider Preview Build 22581 for Windows Insiders in the Dev and Beta Channels. Build 22581 is being flighted to Windows Insiders in the Beta Channel, which means going forward, both the Dev and Beta Channels will be receiving the same builds.

The Windows development team has reminded Insiders that this will be a good time to switch channels if you don't wish to receive these active builds.