diff --git a/org.omg.sysml.logic/src/main/java/org/omg/sysml/delegate/setting/Type_featureMembership_SettingDelegate.java b/org.omg.sysml.logic/src/main/java/org/omg/sysml/delegate/setting/Type_featureMembership_SettingDelegate.java
index 321f65232..3cbb7fb26 100644
--- a/org.omg.sysml.logic/src/main/java/org/omg/sysml/delegate/setting/Type_featureMembership_SettingDelegate.java
+++ b/org.omg.sysml.logic/src/main/java/org/omg/sysml/delegate/setting/Type_featureMembership_SettingDelegate.java
@@ -2,7 +2,8 @@
  * SysML 2 Pilot Implementation
  * Copyright (c) 2022 Siemens AG
  * Copyright (c) 2022, 2026 Model Driven Solutions, Inc.
- *    
+ * Copyright (c) 2026 Obeo
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the Eclipse Public License as published by
  * the Eclipse Foundation, version 2 of the License.
@@ -25,6 +26,7 @@
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.emf.ecore.InternalEObject;
 import org.omg.sysml.lang.sysml.Type;
+import org.omg.sysml.util.ElementUtil;
 import org.omg.sysml.util.TypeUtil;
 
 public class Type_featureMembership_SettingDelegate extends BasicDerivedListSettingDelegate {
@@ -35,7 +37,8 @@ public Type_featureMembership_SettingDelegate(EStructuralFeature eStructuralFeat
 
 	@Override
 	protected EList<?> basicGet(InternalEObject owner) {
-		return TypeUtil.getFeatureMembershipOf((Type)owner);
+		ElementUtil.clearCachesOf((Type) owner);
+		return TypeUtil.getFeatureMembershipOf((Type) owner);
 	}
 
 }
diff --git a/org.omg.sysml.logic/src/test/java/org/omg/sysml/logic/TypeFeatureMembershipCacheTest.java b/org.omg.sysml.logic/src/test/java/org/omg/sysml/logic/TypeFeatureMembershipCacheTest.java
new file mode 100644
index 000000000..ed41d7689
--- /dev/null
+++ b/org.omg.sysml.logic/src/test/java/org/omg/sysml/logic/TypeFeatureMembershipCacheTest.java
@@ -0,0 +1,103 @@
+/*******************************************************************************
+ * SysML 2 Pilot Implementation
+ * Copyright (c) 2026 Obeo
+ *    
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *  
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *  
+ * @license LGPL-3.0-or-later <http://spdx.org/licenses/LGPL-3.0-or-later>
+ *  
+ *******************************************************************************/
+
+package org.omg.sysml.logic;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+
+import org.eclipse.emf.common.util.EList;
+import org.junit.Test;
+import org.omg.sysml.lang.sysml.Feature;
+import org.omg.sysml.lang.sysml.FeatureMembership;
+import org.omg.sysml.lang.sysml.SysMLFactory;
+import org.omg.sysml.lang.sysml.Type;
+import org.omg.sysml.util.TypeUtil;
+
+/**
+ * Verifies that derived feature memberships reflect owned membership mutations that happen after an initial read.
+ */
+public class TypeFeatureMembershipCacheTest {
+
+	/**
+     * Verifies that a second read of {@link Type#getFeatureMembership()} sees a newly added owned membership after the
+     * first read has already populated the derived list.
+     */
+    @Test
+    public void getFeatureMembershipReflectsOwnedMembershipsAddedAfterFirstRead() {
+        initializeStandalone();
+
+        Type type = this.createType("FixtureType");
+        Feature initialFeature = this.createFeature("initialFeature");
+        FeatureMembership initialMembership = TypeUtil.addOwnedFeatureTo(type, initialFeature);
+
+        EList<FeatureMembership> initialMemberships = type.getFeatureMembership();
+
+        assertEquals(1, initialMemberships.size());
+        assertSame(initialMembership, initialMemberships.get(0));
+        assertSame(initialFeature, initialMemberships.get(0).getOwnedMemberFeature());
+
+        Feature addedFeature = this.createFeature("addedFeature");
+        FeatureMembership addedMembership = TypeUtil.addOwnedFeatureTo(type, addedFeature);
+
+        EList<FeatureMembership> updatedMemberships = type.getFeatureMembership();
+
+        assertEquals(2, updatedMemberships.size());
+        assertTrue(updatedMemberships.contains(initialMembership));
+        assertTrue(updatedMemberships.contains(addedMembership));
+        assertSame(addedMembership, updatedMemberships.get(1));
+        assertSame(addedFeature, updatedMemberships.get(1).getOwnedMemberFeature());
+    }
+
+    /**
+     * Installs the standalone delegates used by direct EMF logic tests.
+     */
+    private void initializeStandalone() {
+        SysMLLogicStandaloneSetup.doSetup();
+    }
+
+    /**
+     * Creates a type with the given declared name.
+     *
+     * @param name
+     *            the declared type name used in the test fixture
+     * @return a new type instance
+     */
+    private Type createType(String name) {
+        Type type = SysMLFactory.eINSTANCE.createType();
+        type.setDeclaredName(name);
+        return type;
+    }
+
+    /**
+     * Creates a feature with the given declared name.
+     *
+     * @param name
+     *            the declared feature name used in the test fixture
+     * @return a new feature instance
+     */
+    private Feature createFeature(String name) {
+        Feature feature = SysMLFactory.eINSTANCE.createFeature();
+        feature.setDeclaredName(name);
+        return feature;
+    }
+}