9to5Mac published a story that Apple has released the first beta of macOS 11.4 to registered developers.

Apple releases first developer beta of macOS 11.4 ahead of 11.3 public release

We just got the macOS 11.3 release candidate yesterday after Apple’s Spring Loaded event. And ahead of the 11.3 public launch that could coincide with iOS 14.5 next week, Apple has seeded developers with the first beta for macOS 11.4.

Apple releases first developer beta of macOS 11.4 ahead of 11.3 public release - 9to5Mac