MacRumors published a story that Apple has released the macOS Big Sur 11.4 release candidate to registered developers.

Apple Seeds macOS Big Sur 11.4 Release Candidate to Developers

Apple today seeded the release candidate version of an upcoming macOS Big Sur 11.4 update to developers for testing purposes, with the new beta coming two weeks after the release of the third macOS Big Sur 11.4 beta. Developers can download the ‌‌‌‌macOS Big Sur‌‌‌‌ 11.4 beta using the Software Update mechanism in System Preferences after installing the proper profile from the Apple Developer Center.

Apple Seeds macOS Big Sur 11.4 Release Candidate to Developers