diff --git a/apps/user_ldap/lib/Group_LDAP.php b/apps/user_ldap/lib/Group_LDAP.php
index 723b3d856ad..81cb30dd25b 100644
--- a/apps/user_ldap/lib/Group_LDAP.php
+++ b/apps/user_ldap/lib/Group_LDAP.php
@@ -57,7 +57,7 @@ class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, I
 
 	/** @var CappedMemoryCache<string[]> $cachedGroupMembers array of users with gid as key */
 	protected CappedMemoryCache $cachedGroupMembers;
-	/** @var CappedMemoryCache<string[]> $cachedGroupsByMember array of groups with uid as key */
+	/** @var CappedMemoryCache<array[]> $cachedGroupsByMember array of groups with uid as key */
 	protected CappedMemoryCache $cachedGroupsByMember;
 	/** @var CappedMemoryCache<string[]> $cachedNestedGroups array of groups with gid (DN) as key */
 	protected CappedMemoryCache $cachedNestedGroups;
@@ -1129,6 +1129,9 @@ class Group_LDAP extends BackendUtility implements GroupInterface, IGroupLDAP, I
 	}
 
 	/**
+	 * @template T
+	 * @param array<array-key, T> $listOfGroups
+	 * @return array<array-key, T>
 	 * @throws ServerNotAvailableException
 	 * @throws Exception
 	 */
diff --git a/build/psalm-baseline.xml b/build/psalm-baseline.xml
index dc2b8a8f10a..e672dee4c0e 100644
--- a/build/psalm-baseline.xml
+++ b/build/psalm-baseline.xml
@@ -1628,20 +1628,10 @@
     <ParadoxicalCondition occurrences="1"/>
   </file>
   <file src="apps/user_ldap/lib/Group_LDAP.php">
-    <InvalidReturnStatement occurrences="1">
-      <code>$groupName</code>
-    </InvalidReturnStatement>
-    <InvalidReturnType occurrences="1">
-      <code>bool</code>
-    </InvalidReturnType>
-    <InvalidScalarArgument occurrences="2">
+    <InvalidScalarArgument occurrences="1">
       <code>$groupID</code>
       <code>$groupID</code>
     </InvalidScalarArgument>
-    <RedundantCondition occurrences="2">
-      <code>is_array($groupDNs)</code>
-      <code>is_array($list)</code>
-    </RedundantCondition>
   </file>
   <file src="apps/user_ldap/lib/Group_Proxy.php">
     <ParamNameMismatch occurrences="1">