First, tried downloading the installer.pkg file from Mr. Macintosh's site, but when trying to use it with OCLP 0.6.6n to create a USB installer it says "22F59" (the real 13.4 version is build 22F66) in the Use Existing Installer window. Still not sure if that info is correct or a glitch in the build info reporting. Next tried using OCLP to download the install macOS, and I get the same "22F59"! Apple's servers are in error or the OCLP app doesn't read the build # correctly.
In either case, that makes for uncertainty!