The @shell keyword is broken:

# pkg install -f bash
Updating packagesite repository catalogue...
packagesite repository is up to date.
All repositories are up to date.
Checking integrity... done (0 conflicting)
The following 1 package(s) will be affected (of 0 checked):

Installed packages to be REINSTALLED:
        bash-5.0.18_3

Number of packages to be reinstalled: 1

Proceed with this action? [y/N]: y
[1/1] Reinstalling bash-5.0.18_3...
[1/1] Extracting bash-5.0.18_3: 100%
pkg: Failed to execute lua script: [string "shell_path = pkg.prefixed_path("bin/bash")..."]:7: attempt to index a nil value (global 'shell')
pkg: lua script failed


Same for other ports with the @shell keyword (devel/git), same within poudriere testport.

The last change to Keywords/shell.ucl replaced the working sh implementation with Lua. I noticed the problem with the second git upgrade since then, so this was the first time pkg tried to run a post-deinstall script that has the Lua implementation.

FreeBSD 12.2-RELEASE (releng/12.2), pkg 1.15.10, ports head, amd64.