released ecs is prefixed and doesn't require any package, see

the vendor/ inside is prefixed, could you share your minimal composer.json that produce error?

Sure, it worked with 12.5.12 and 12.5.14

{
    "name": "test/test",
    "require": {
        "symfony/console": "v7.2.5"
    },
    "require-dev": {
        "symplify/easy-coding-standard": "12.5.15"
    }
}

There was a glitch on packagist. I've bumped another tag to trigger composer update.

12.5.16 is downgraded correctly 👍 Update your ECS and let me know, if it works for you

Looking good. Pipelines are green again! Thanks for the quick fix!

👍