A lot of developer work. Apple introduced fourth beta of iOS 13.4, iPadOS 13.4, tvOS 13.4 and macOS Catalina 10.15.4. These betas are continuing the development of this competition to update Apple systems, with their release date scheduled for later this month. The one that is not updated by watchOS: in this case we are continuing with beta 3.
There are rumors, as long as coronavirus allows, that Apple may unveil stable versions of these betas in the month-end event and new products. Some years have already happened, so it would mean that the same thing is happening in 2020.
New to the forefront of these betas are likely users We get MacOS and iOS / IPO apps for one purchase, thereby making it easier to provide new payment software in the App Store and Mac App Store. In addition to that we have improved stability and development, as well as new upgrades to the previous air system.
As always, we don't recommend that you install these beta versions if you're not entirely sure what you're doing. These are unstable versions, with faults and lower performance than expected. The best thing you can do is wait for the stable version to be launched within a few weeks.