Installer path ignored for dev versions?

[GaryJones]

I'm pulling in two WordPress plugins via Composer - one with a tag constraint, one from a dev-trunk branch. The latter is being installed to the (custom) vendor directory, instead of the location set out in the installer-paths value.

When I run composer install -vvv or composer update -vvv with the following:

  "require": {
    "php": ">=8.3",
    "composer/installers": "^2",
    "buddypress/buddypress": "^14.3",
    "bbpress/bbpress": "dev-trunk"
  },
  "config": {
    "vendor-dir": "./client-mu-plugins/vendor",
    "preferred-install": "dist",
    "sort-packages": true,
    "allow-plugins": {
      "dealerdirect/phpcodesniffer-composer-installer": true,
      "composer/installers": true
    }
  },
  "extra": {
    "installer-paths": {
      "plugins/buddypress": ["buddypress/buddypress"],
      "plugins/bbpress": ["bbpress/bbpress"]
    }
  },

I get the following:

Installs: bbpress/bbpress:dev-trunk 4d538c1, buddypress/buddypress:14.3.4
Reading /Users/gary/Library/Caches/composer/files/bbpress/bbpress/7d8c15849c0a17a5ab44178c1447653b4ebef6f8.zip from cache

• Loading bbpress/bbpress (dev-trunk 4d538c1) from cache
  Executing command (CWD): 'svn' '--version'
• Installing bbpress/bbpress (dev-trunk 4d538c1): Extracting archive
  Executing async command (CWD): '/usr/bin/unzip' '-qq' '/Users/gary/code/community-wpvip/./client-mu-plugins/vendor/composer/tmp-bc9606b1daa412ace2fe9e34f17f5932.zip' '-d' '/Users/gary/code/community-wpvip/./client-mu-plugins/vendor/composer/8fd4c4a6'
• Marking bbpress/bbpress (9999999-dev 4d538c1) as installed, alias of bbpress/bbpress (dev-trunk 4d538c1)
• Installing buddypress/buddypress (14.3.4): Checking out /tags/14.3.4/@3259478
  Executing command (CWD): 'svn' 'co' '--non-interactive' '--' 'https://plugins.svn.wordpress.org/buddypress//tags/14.3.4/@3259478' '/Users/gary/code/community-wpvip/plugins/buddypress'

Summary: BuddyPress 14.3.4 correctly installs into plugins/buddypress via checking out the tag, but bbPress trunk installs to a customer vendor directory by extracting from a zip. I'd like the zip extracted into the correct plugins/bbpress directory as well.

$ composer --version
Composer version 2.8.7 2025-04-03 16:26:28
PHP version 8.3.16 (/opt/homebrew/Cellar/php@8.3/8.3.16/bin/php)

Side context: https://bbpress.trac.wordpress.org/ticket/3630 explains how the composer.json file isn't in the tagged code, which is why I'm having to use dev- branch in the first place.