Moving override-settings to new config/system directory fails composer install with database updateschema command

[Patta]

To be in line with the new default directory for the system configuration of typo3 v12, we want to move our config files to the new config/system directory.

The directory layout configuration from https://github.com/helhum/typo3-config-handling/tree/main?tab=readme-ov-file#default-layout is changed to the following and the yaml files are moved to config/system.

{
    "extra": {
        "helhum/typo3-config-handling": {
            "settings": "config/system/settings.yaml",
            "dev-settings": "config/system/dev.settings.yaml",
            "override-settings": "config/system/override.settings.yaml"
        }
    }
}

In our override.settings.yaml we set the database connection for ddev. (In production/remote server for the remote database server...)

DB:
    Connections:
        Default:
            charset: utf8mb4
            dbname: db
            driver: mysqli
            host: db
            password: db
            port: 3306
            tableoptions:
                charset: utf8mb4
                collate: utf8mb4_unicode_ci
            user: db

We update the database schema after every composer update or install in post-install-cmd and post-update-cmd in our root composer.json with the typo3-console command typo3 database:updateschema.

...
"scripts": {
        "post-install-cmd": [
            "typo3 database:updateschema",
            "typo3 extension:setup",
            "@clearassets",
            "typo3 cache:flush",
            "@warmupcache"
        ],
        "post-update-cmd": [
            "typo3 database:updateschema",
            "typo3 extension:setup",
            "@clearassets",
            "typo3 cache:flush"
        ],
    },
...

Unfortunately, the composer install/update now fails when typo3 database:updateschema is executed after composer install/update. Without this command or if the override.settings.yaml is placed not in the config/system directory but just in config, the composer install/update works.

...:/var/www/html$ composer u
Gathering patches for root package.
Loading composer repositories with package information
Updating dependencies
Nothing to modify in lock file
Installing dependencies from lock file (including require-dev)
Nothing to install, update or remove
Generating optimized autoload files
Generating class alias map file
helhum/dotenv-connector: Generated dotenv include file
Publishing public assets of TYPO3 extensions
Published public assets
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> typo3 database:updateschema

Uncaught TYPO3 Exception array_keys(): Argument #1 ($array) must be of type array, null given
thrown in file /var/www/html/vendor/typo3/cms-core/Classes/Database/ConnectionPool.php
in line 290

Script typo3 database:updateschema handling the post-update-cmd event returned with error code 1
...:/var/www/html$