Issue #3310666: UpdaterForm throws an exception if you try to update to the next minor beta

package_manager/tests/fixtures/release-history/drupal.9.8.0-beta1.xml

@@ -9,7 +9,7 @@ Contains metadata about the following (fake) releases of Drupal core, in order:
     <title>Drupal</title>
     <short_name>drupal</short_name>
     <dc:creator>Drupal</dc:creator>
-    <supported_branches>9.8.</supported_branches>
+    <supported_branches>9.8.,9.7.</supported_branches>
     <project_status>published</project_status>
     <link>http://example.com/project/drupal</link>
     <terms>