diff --git a/backend/open_webui/models/messages.py b/backend/open_webui/models/messages.py
index 8b031404e6..cdc51f0139 100644
--- a/backend/open_webui/models/messages.py
+++ b/backend/open_webui/models/messages.py
@@ -113,14 +113,19 @@ class MessageUserResponse(MessageModel):
 
 
 class MessageUserSlimResponse(MessageUserResponse):
-    data: bool | None = None
+    data: dict | bool | None = None
 
     @field_validator('data', mode='before')
-    def convert_data_to_bool(cls, v):
+    def summarize_data(cls, v):
         # No data or not a dict → False
         if not isinstance(v, dict):
             return False
 
+        # Reply previews need card text, but not actions or other message data.
+        app = v.get('app')
+        if isinstance(app, dict) and app.get('embeds'):
+            return {'app': {'embeds': app['embeds']}}
+
         # True if ANY value in the dict is non-empty
         return any(bool(val) for val in v.values())
 
diff --git a/src/lib/components/chat/Messages/Markdown/MarkdownInlineTokens/MentionToken.svelte b/src/lib/components/chat/Messages/Markdown/MarkdownInlineTokens/MentionToken.svelte
index e808d78328..5efc5f5425 100644
--- a/src/lib/components/chat/Messages/Markdown/MarkdownInlineTokens/MentionToken.svelte
+++ b/src/lib/components/chat/Messages/Markdown/MarkdownInlineTokens/MentionToken.svelte
@@ -107,7 +107,10 @@
 			browser &&
 			idType === 'U' &&
 			requestedUserId !== id &&
-			(!token?.label || token.label === id || /^[0-9a-f]{8}-[0-9a-f-]{27}$/i.test(token.label))
+			(!token?.label ||
+				token.label === _id ||
+				token.label === id ||
+				/^[0-9a-f]{8}-[0-9a-f-]{27}$/i.test(token.label))
 		) {
 			requestedUserId = id;
 			resolvedUser = null;