mikadoZero, (Probably) not a solution to your problem, I'm afraid, but:
mikadoZero wrote:
I did copy the suggested exports that were output when I ran `guixpackage --manifest=manifest.scm` into .zprofile and they were:
Guix does *not* suggest copying these into shell initialisation files, and you should remove the ones you've added.
Kind regards, T G-R