MacRumors published a story that Apple has released the third betas of iOS and iPadOS 13.4 for testing.

Apple Seeds Third Betas of iOS and iPadOS 13.4 to Developers

Apple today seeded the third betas of upcoming iOS and iPadOS 13.4 updates to developers, one week after the release of the second betas and a month after the release of iOS and iPadOS 13.3.1.

iOS and ‌‌iPadOS 13.4 can be downloaded from the Apple Developer center or over the air once the proper developer profile has been installed. On the iPhone 11, 11 Pro, and 11 Pro Max, Apple requires the beta to be installed over the air using the configuration profile.

  Apple Seeds Third Betas of iOS and iPadOS 13.4 to Developers [Update: Public Beta Available]