diff --git a/src/plugins/hooks.ts b/src/plugins/hooks.ts
index b5099fcb3a0..a45211748b6 100644
--- a/src/plugins/hooks.ts
+++ b/src/plugins/hooks.ts
@@ -186,7 +186,9 @@ function namespaceMessageMeta(
   if (!result?.messageMeta || Object.keys(result.messageMeta).length === 0) {
     return;
   }
-  result.messageMeta = { [pluginId]: result.messageMeta };
+  // Shallow-copy the original meta before wrapping so we never mutate the
+  // plugin's returned object (which may be a reused module-level constant).
+  result.messageMeta = { [pluginId]: { ...result.messageMeta } };
 }
 
 /**
diff --git a/ui/src/ui/chat/message-extract.ts b/ui/src/ui/chat/message-extract.ts
index bfb23d03f29..edd16e1e7ae 100644
--- a/ui/src/ui/chat/message-extract.ts
+++ b/ui/src/ui/chat/message-extract.ts
@@ -36,7 +36,10 @@ function stripDisplayPatterns(text: string, message: unknown): string {
         // skip invalid regex
       }
     }
-    return result.trimStart();
+    // Still run hardcoded fallback after pattern-driven strip: if the
+    // plugin-provided regex was malformed or missed a variant format,
+    // the safety net catches it.
+    return stripRelevantMemoriesTags(result.trimStart());
   }
 
   // Hardcoded fallback: strip <relevant-memories> tags even when messageMeta