Update changelog.mdx

Author: mintlify[bot]

changelog.mdx

@@ -5,6 +5,15 @@ rss: true
 noindex: true
 ---
 
+<Update label="September 27 - October 3" tags={["Bug fixes"]} rss={{ title: "Weekly Updates", description: "404 page improvements for multilingual sites" }}>
+
+## Bug fixes and reliability
+
+- Fixed 404 page link suggestions for multilingual documentation sites to only show links in the site's primary language instead of mixed languages
+- Enhanced search filtering logic to use the first configured language as the default filter when multiple languages are available
+
+</Update>
+
 <Update label="September 20 - September 26" tags={["Improvements"]} rss={{ title: "Weekly Updates", description: "Language support expansion, UI improvements, and infrastructure enhancements" }}>
 
 ## Language support expansion