Fix Magento 2.4.8 Composer/Vendor Installation Issue

We have a Magento 2.4.8 installation on Ubuntu 24 with Apache 2.4. The vendor directory has missing files from an incomplete Magento 1 to Magento 2 migration. This causes setup:di:compile to fail partially and the site crashes intermittently. Server details: Ubuntu 24, Apache 2.4, Magento 2.4.8 IP: [login to view URL] Theme: Aellon/tech (child of Codazon) The specific problem: The directory /var/www/html/vendor/magento/framework/MessageQueue/ is incomplete. The Publisher/Config/CompositeReader interceptor never generates during setup:di:compile, causing this error at runtime: Class "Magento\Framework\MessageQueue\Publisher\Config\CompositeReader\Interceptor" does not exist What we have already tried: composer install --no-dev — hung for 40+ minutes, was killed composer install --no-cache — completed but said "Nothing to install, update or remove" — did not restore missing files composer reinstall magento/framework — removed and reinstalled the package but MessageQueue directory was not restored composer update magento/framework — hung and was killed Downloaded Magento 2.4.8 tarball from GitHub, extracted MessageQueue directory manually (233 files restored) — files are present but Publisher interceptor still not generating during compile Downloaded individual [login to view URL] from GitHub — did not resolve Multiple runs of setup:di:compile with php -d memory_limit=2G — compile completes without errors but Publisher interceptor never generates Current state: Site is UP and working Checkout, eWay and PayPal payments working setup:di:compile runs without errors but is incomplete MessageQueue directory now has 233 files (restored from GitHub tarball) Publisher/Config/CompositeReader interceptor still missing from generated/code Custom module MTBlades_KlaviyoEvents is disabled — cannot be enabled until compile is stable What needs to be fixed: Identify why setup:di:compile is not generating the Publisher/Config/CompositeReader interceptor despite source files being present Fix the underlying composer/vendor issue so compile completes fully in a single pass Verify compile is stable by running it 3 times consecutively with no missing interceptors Once compile is stable, enable custom module MTBlades_KlaviyoEvents and verify it compiles cleanly Set up a staging environment that mirrors the live site for safe future testing Important notes: Do NOT run composer install as root without using COMPOSER_ALLOW_SUPERUSER=1 All Magento CLI commands must run as www-data: cd /var/www/html && sudo -u www-data php bin/magento [command] A full Contabo server snapshot exists as backup dated May 6 2026 Do NOT enable MTBlades_KlaviyoEvents module until compile is verified stable Do NOT touch eWay or PayPal configuration Skills required: Magento 2 (expert level) Linux/Ubuntu server administration Composer and PHP dependency management Experience with Magento 1 to Magento 2 migrations

Project ID: 40424242