diff --git a/internal/check-composites-mount.mjs b/internal/check-composites-mount.mjs
index fcd5b6ba4..656135e59 100644
--- a/internal/check-composites-mount.mjs
+++ b/internal/check-composites-mount.mjs
@@ -123,7 +123,10 @@ if (!list.length) { console.error('COMPOSITES-MOUNT: FAIL, found no composites (
 // would fail a correct composite for a missing app.use and pass nothing real, so the gate RUNS the
 // entry: every defineCustomElement(...) in plugin-designs/<bundle>/index.js is swapped for a
 // recorder, and the recorded component + configureApp are what gets mounted.
-const ENTRY_RE = /plugin-designs\/[^/]+\/index\.js$/
+// ★ AND THE SHARED HELPER. Since every entry builds its element through
+// library/elements/defineMapElement.js, the defineCustomElement call lives THERE, not in index.js.
+// Capturing only index.js recorded nothing, and every composite read as 'defines neither'.
+const ENTRY_RE = /(plugin-designs\/[^/]+\/index\.js|library\/elements\/defineMapElement\.js)$/
 const entryCapture = {
   name: 'gate-entry-capture',
   enforce: 'post',