Problem with bash completions in arch distros

[mwoodpatrick]

I'm seeing a very strange issue when running Arch Linux on WSL-2 that I'm not seeing with other distros e.g. Ubuntu 22.04.

When I install Arch Linux on WSL-2 using ArcWSL and then install augeas

pacman -Sy augeas

and run:

source /usr/share/bash-completion/completions/augmatch

I'm getting:

-bash: /usr/share/bash-completion/completions/augmatch: line 9: syntax error near unexpected token `('
-bash: /usr/share/bash-completion/completions/augmatch: line 9: `        --help | -!(-*)[h])'

If I copy that completions file to the Ubuntu 22.04 distro and run the same command it reports no error, similarly running shellcheck or bashlint they don't report any issues so I believe there is no syntax error in the file. Running the same command on my Alpine distro does report a syntax error.

Is anyone else seeing issues with running these commands or on sourcing the attached file
augmatch.txt