Beta updates should not be enabled on production sites with live traffic.
GeneratePress (theme)
When we release a beta version of the theme, you’ll need to manually install the new version on top of your existing version.
If you’re installing the theme on a fresh WordPress install, you can just download the .zip file inside your account, and go to Appearance > Themes > Upload Theme in your WordPress Dashboard to upload it.
GP Premium
Alternative, you can opt in to receive beta updates in Appearance > GeneratePress which will serve beta updates directly to your Dashboard as a regular plugin bug.