pyenv activate works but the completion pyenv-activate not work!

[roachsinai]

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Description

• [x] Platform information (e.g. Ubuntu Linux 16.04):Manjaro latest
• [x] OS architecture (e.g. amd64):x86-64
• [x] pyenv version:1.2.15
• [x] Python version:system 3.8

I'm using zsh, and got the completions as below when input pyenv:

hmank ~/./versions » pyenv --version
pyenv                    PYENV_ROOT               pyenv-uninstall          pyenv-virtualenv-init                           
pyenv-activate           pyenv-sh-activate        PYENV_VERSION_OLD        PYENV_VIRTUALENV_INIT                           
pyenv-deactivate         pyenv-sh-deactivate      pyenv-virtualenv         pyenv-virtualenv-prefix                         
pyenv-install            PYENV_SHELL              pyenv-virtualenv-delete  pyenv-virtualenvs

I install a python3.7 version by pyenv install 3.7.4, then create a virtualenv by pyenv-virtualenv by pyenv virtualenv 3.7.4 nn.

And pyenv activate nn active the nn successfully.

But the zsh completion pyenv-activate nn failed, got error:

Failed to activate virtualenv.

Perhaps pyenv-virtualenv has not been loaded into your shell properly.
Please restart current shell and try again.

Same error when I use pyenv-activate 3.7.4.

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What's the difference between pyenv-activate and pyenv activate ?

Why pyenv-activate not work?