diff --git a/solr/CHANGES.txt b/solr/CHANGES.txt
index 3212a6f387e..3f6911b42cb 100644
--- a/solr/CHANGES.txt
+++ b/solr/CHANGES.txt
@@ -195,6 +195,8 @@ Bug Fixes
 * SOLR-11459: In-place update of nonexistent doc following existing doc update fails to create the doc.
   (Andrey Kudryavtsev via Mikhail Khludnev)
 
+* SOLR-11931: Fix contrib/ltr custom inner class feature/normaliser/model persistence. (Christine Poerschke)
+
 Optimizations
 ----------------------
 
diff --git a/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedFeatureStore.java b/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedFeatureStore.java
index 6b415a66393..9ef36b876de 100644
--- a/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedFeatureStore.java
+++ b/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedFeatureStore.java
@@ -192,7 +192,7 @@ public class ManagedFeatureStore extends ManagedResource implements ManagedResou
   private static LinkedHashMap<String,Object> toFeatureMap(Feature feat) {
     final LinkedHashMap<String,Object> o = new LinkedHashMap<>(4, 1.0f); // 1 extra for caller to add store
     o.put(NAME_KEY, feat.getName());
-    o.put(CLASS_KEY, feat.getClass().getCanonicalName());
+    o.put(CLASS_KEY, feat.getClass().getName());
     o.put(PARAMS_KEY, feat.paramsToMap());
     return o;
   }
diff --git a/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedModelStore.java b/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedModelStore.java
index 342a14067c6..bdc4cfd9df2 100644
--- a/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedModelStore.java
+++ b/solr/contrib/ltr/src/java/org/apache/solr/ltr/store/rest/ManagedModelStore.java
@@ -268,7 +268,7 @@ public class ManagedModelStore extends ManagedResource implements ManagedResourc
     final LinkedHashMap<String,Object> modelMap = new LinkedHashMap<>(5, 1.0f);
 
     modelMap.put(NAME_KEY, model.getName());
-    modelMap.put(CLASS_KEY, model.getClass().getCanonicalName());
+    modelMap.put(CLASS_KEY, model.getClass().getName());
     modelMap.put(STORE_KEY, model.getFeatureStoreName());
 
     final List<Map<String,Object>> features = new ArrayList<>();
@@ -321,7 +321,7 @@ public class ManagedModelStore extends ManagedResource implements ManagedResourc
   private static LinkedHashMap<String,Object> toNormalizerMap(Normalizer norm) {
     final LinkedHashMap<String,Object> normalizer = new LinkedHashMap<>(2, 1.0f);
 
-    normalizer.put(CLASS_KEY, norm.getClass().getCanonicalName());
+    normalizer.put(CLASS_KEY, norm.getClass().getName());
 
     final LinkedHashMap<String,Object> params = norm.paramsToMap();
     if (params != null) {
diff --git a/solr/contrib/ltr/src/test/org/apache/solr/ltr/store/rest/TestModelManagerPersistence.java b/solr/contrib/ltr/src/test/org/apache/solr/ltr/store/rest/TestModelManagerPersistence.java
index a056cf7e340..16a202f99d7 100644
--- a/solr/contrib/ltr/src/test/org/apache/solr/ltr/store/rest/TestModelManagerPersistence.java
+++ b/solr/contrib/ltr/src/test/org/apache/solr/ltr/store/rest/TestModelManagerPersistence.java
@@ -22,14 +22,17 @@ import java.io.FileOutputStream;
 import java.io.OutputStreamWriter;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.solr.ltr.TestRerankBase;
+import org.apache.solr.ltr.feature.Feature;
 import org.apache.solr.ltr.feature.FieldValueFeature;
 import org.apache.solr.ltr.feature.ValueFeature;
 import org.apache.solr.ltr.model.DefaultWrapperModel;
 import org.apache.solr.ltr.model.LinearModel;
+import org.apache.solr.ltr.norm.Normalizer;
 import org.apache.solr.ltr.store.FeatureStore;
 import org.junit.BeforeClass;
 import org.junit.Test;
@@ -261,4 +264,67 @@ public class TestModelManagerPersistence extends TestRerankBase {
 
     // NOTE: we don't test the persistence of the deletion here because it's tested in testFilePersistence
   }
+
+  public static class DummyCustomFeature extends ValueFeature {
+    public DummyCustomFeature(String name, Map<String,Object> params) {
+      super(name, params);
+    }
+  }
+
+  public static class DummyCustomModel extends LinearModel {
+    public DummyCustomModel(String name, List<Feature> features, List<Normalizer> norms, String featureStoreName,
+        List<Feature> allFeatures, Map<String,Object> params) {
+      super(name, features, norms, featureStoreName, allFeatures, params);
+    }
+  }
+
+  @Test
+  public void testInnerCustomClassesPersistence() throws Exception {
+
+    final String featureStoreName = "test42";
+
+    final String featureName = "feature42";
+    final String featureClassName;
+    if (random().nextBoolean()) {
+      featureClassName = ValueFeature.class.getName();
+    } else {
+      featureClassName = DummyCustomFeature.class.getName();
+    }
+
+    loadFeature(featureName, featureClassName, "test42",
+        "{\"value\":"+random().nextInt(100)+"}");
+    assertJQ(ManagedFeatureStore.REST_END_POINT + "/"+featureStoreName,
+        "/features/[0]/name=='"+featureName+"'");
+
+    final String modelName = "model42";
+    final String modelClassName;
+    if (random().nextBoolean()) {
+      modelClassName = LinearModel.class.getName();
+    } else {
+      modelClassName = DummyCustomModel.class.getName();
+    }
+
+    loadModel(modelName, modelClassName,
+        new String[] { featureName }, featureStoreName,
+        "{\"weights\":{\""+featureName+"\":1.0}}");
+    assertJQ(ManagedModelStore.REST_END_POINT,
+        "/models/[0]/name=='"+modelName+"'");
+
+    restTestHarness.reload();
+    assertJQ(ManagedFeatureStore.REST_END_POINT + "/"+featureStoreName,
+        "/features/[0]/name=='"+featureName+"'");
+    assertJQ(ManagedModelStore.REST_END_POINT,
+        "/models/[0]/name=='"+modelName+"'");
+
+    assertJDelete(ManagedModelStore.REST_END_POINT + "/"+modelName,
+        "/responseHeader/status==0");
+    assertJQ(ManagedModelStore.REST_END_POINT,
+        "/models/==[]");
+
+    assertJDelete(ManagedFeatureStore.REST_END_POINT + "/"+featureStoreName,
+        "/responseHeader/status==0");
+    assertJQ(ManagedFeatureStore.REST_END_POINT + "/"+featureStoreName,
+        "/features/==[]");
+  }
+
 }