How to make alias to systemctl with autocomplete

I tried

alias sct='systemctl'
complete -F _systemctl sct

But the function _systemctl is not found until I run the original command systemctl in the session. This function loads dynamically or somehow and contains many other same functions inside.

OS - Ubuntu 20.04

Create a file named /etc/bash_completion.d/systemctl:

if [[ -r /usr/share/bash-completion/completions/systemctl ]]; then
    . /usr/share/bash-completion/completions/systemctl && complete -F _systemctl systemctl sct
fi

^{You can restart bash-completion by sourcing . /etc/bash_completion}

How to make alias to systemctl with autocomplete

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