MacOS 12.1 Beta 4 not installing on external hard drive

I'm trying to install MacOS Monterey 12.1 Beta 4 on a external hard drive using a M1 Max Macbook Pro, I'm having trouble install Beta 4 seems like it goes through everything just fine, but once it restarts and I check the version number it still says 12.0.1 and I do have the beta profile installed on the External hard drive that I put the Beta on.

Any suggestion