- Root cause: two prod sites share one Memcached, no WP_CACHE_KEY_SALT → cache keys collide → data mixes between sites - Primary fix: WP_CACHE_KEY_SALT defined via DB_NAME in wp-config.php (manual on each prod, file is in .gitignore) - MU-plugin restored: auto-detect backend, versioned keys, auto-invalidation - Added re-salt fallback via salt_keys(DB_NAME) on muplugins_loaded - Removed duplicate admin_notice hooks |
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| .. | ||
| .gitkeep | ||
| acf-loader.php | ||
| object-cache-bootstrap.php | ||