Just to follow up here before you try to switch over to the beta version. We’ve gotten good feedback from testers for this beta version and we release the official production version of Codebook for macOS 4.5.8 this morning, so you should be able to just Check for Updates as you usually do to receive the updated version with the fix instead of switching over to the beta version. (either via Codebook menu > Check for Updates in the direct version, or via the App Store if you have the Mac App Store version)
Let us know if that properly resolves the issue for you. Thanks!