diff --git a/cli/updates_xml_build.php b/cli/updates_xml_build.php
index 44ec33b..106d8e6 100644
--- a/cli/updates_xml_build.php
+++ b/cli/updates_xml_build.php
@@ -194,12 +194,14 @@ $stabilitySuffixMap = [
 	'development' => '-dev',
 ];
 
+// Joomla's stabilityTagToInteger() maps these to STABILITY_* constants.
+// MUST use 'dev' not 'development' — STABILITY_DEVELOPMENT does not exist.
 $stabilityTagMap = [
 	'stable'      => 'stable',
 	'rc'          => 'rc',
 	'beta'        => 'beta',
 	'alpha'       => 'alpha',
-	'development' => 'development',
+	'development' => 'dev',
 ];
 
 // -- Build update entries -----------------------------------------------------
@@ -212,11 +214,13 @@ $primaryVersion = $version . $primarySuffix;
 $downloadUrl = "{$giteaUrl}/{$org}/{$repo}/releases/download/{$releaseTag}/{$typePrefix}{$extElement}-{$primaryVersion}.zip";
 $infoUrl = "{$giteaUrl}/{$org}/{$repo}/releases/tag/{$releaseTag}";
 
-// Build client tag
+// Build client tag — Joomla defaults to client_id=1 (administrator) when missing.
+// Packages install with client_id=0 (site), so we MUST include <client>site</client>
+// for all types to prevent a mismatch that causes extension_id=0 in #__updates.
 $clientTag = '';
 if (!empty($extClient)) {
 	$clientTag = "    <client>{$extClient}</client>";
-} elseif ($extType === 'module' || $extType === 'plugin') {
+} else {
 	$clientTag = '    <client>site</client>';
 }