Problematic line:
extra=( ${${${args#\([^\)]#\)}#\*}%%[:=\[]*} )

Working line:
extra=( ${${${args#\([^\)]#\)}#\*}%%[:\[=]*} )

The problem is the sequence of characters inside the bracket expression of last parameter expansion: [:=\[]
Substitute this for: [:\[=]

Ordinatio Simplex

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Sunday, December 1, 2019 1:42 AM, O. simplex <ordinatio.simplex@protonmail.ch> wrote:

> Distro: Arch Linux
> Version: zsh 5.7.1 (x86_64-pc-linux-gnu)
>
> Action: Type "gpg " then press <tab>
> Actual behavior: termial output is: "_gpg:176: \[]*} not found"
> Expected behavior: suggestions for gpg command
>
> Ordinatio Simplex
>
> Sent with [ProtonMail](https://protonmail.com) Secure Email.