Since the macOS Monterey 12.3 beta was released this week, we have a few news to share about it. It is not only functional with Universal Control or we know that Python 2.7 is no longer supported on macOS and which removes many old kernel extensions. We should also warn that if you install this beta in the wrong place could render your Mac totally useless. So be careful and don't stop reading what we have to tell you that is important.
Regardless of which Mac you have, if you're testing beta 12.3 to see the benefits of Universal control, you should know some things before installing it because if you don't do it in the right place you can end up leaving your computer like a brick. That is not something that we want and less you that your money will have cost you. That's why we always say when talking about Beta you have to be very sure of what you are doing, install them on secondary computers and first of all make backup copies of everything.
Any Mac running macOS High Sierra or later can run multiple versions of the operating system on separate APFS volumes. However Apple says that if your Mac currently has macOS Catalina installed, you should be careful when installing the Monterey 12.3 beta. If the volume you are installing to has FileVault enabled, it could cause a boot loop when you try to log back in to the previous volume. Which by the way, this also applies to the macOS Big Sur 11.6.4 beta.
Said remains. As always, be careful when you install Beta, not only because of what has been said so far, but also because you already know that no matter how stable they are, they are always Betas and that means that they can cause some problems, for example compatibility. Be patient and if it goes very badly for you, you can always remove it and install the official version that exists at that time.