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diff --git a/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1659Test3.java b/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1659Test3.java
new file mode 100644
index 000000000..0abcab280
--- /dev/null
+++ b/tests/org.simantics.db.tests/src/org/simantics/db/tests/regression/bugs/SimanticsBug1659Test3.java
@@ -0,0 +1,82 @@
+package org.simantics.db.tests.regression.bugs;
+
+import java.util.UUID;
+
+import org.junit.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.WriteOnlyGraph;
+import org.simantics.db.common.request.ReadRequest;
+import org.simantics.db.common.request.WriteOnlyRequest;
+import org.simantics.db.common.request.WriteRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.service.ClusterControl;
+import org.simantics.db.testing.base.ExistingDatabaseTest;
+import org.simantics.db.testing.common.TestBase;
+import org.simantics.layer0.Layer0;
+
+public class SimanticsBug1659Test3 extends ExistingDatabaseTest {
+    static int LOOP_COUNT = 10;
+    static int CLUSTER_COUNT = 20;
+    static int RESOURCE_COUNT = 10000;
+    static boolean DEBUG = false;
+    Session session;
+    Resource testRoot;
+    ClusterControl clusterControl;
+    @Test
+    public void testSimanticsBug1659_3()
+    throws DatabaseException {
+        session = getSession();
+        clusterControl = getSession().getService(ClusterControl.class);
+        session.syncRequest(new Init());
+        session.syncRequest(new CreateWriteOnly());
+        for (int i=0; i<LOOP_COUNT; ++i) {
+            session.syncRequest(new Query());
+        }
+    }
+    class Init extends WriteRequest {
+        @Override
+        public void perform(WriteGraph g) throws DatabaseException {
+            Layer0 l0 = Layer0.getInstance(g);
+            Resource rl = g.getResource(TestBase.ROOT_LIBRARY_URI);
+            testRoot = g.newResource();
+            g.claim(testRoot, l0.InstanceOf, l0.Library);          
+            g.claim(rl, l0.ConsistsOf, testRoot);
+        }
+    }
+    class CreateWriteOnly extends WriteOnlyRequest {
+        @Override
+        public void perform(WriteOnlyGraph g) throws DatabaseException {
+            Layer0 b = Layer0.getInstance(getSession());
+            for (int j=0; j<CLUSTER_COUNT; ++j) {
+                Resource root = g.newResource();
+                g.claim(testRoot, b.ConsistsOf, b.PartOf, root);
+                g.flushCluster();
+                for(int i=0; i<RESOURCE_COUNT; i++) {
+                    Resource item = g.newResource();
+                    g.claim(item, b.InstanceOf, null, b.String);
+                    g.claimValue(item, UUID.randomUUID().toString());
+                    g.claim(root, b.ConsistsOf, b.PartOf, item);
+                }
+            }
+        }
+    }
+    class Query extends ReadRequest {
+        @Override
+        public void run(ReadGraph g) throws DatabaseException {
+            Layer0 l0 = Layer0.getInstance(g);
+            for (Resource r : g.getObjects(testRoot, l0.ConsistsOf)) {
+                if (DEBUG)
+                    System.out.println("Resource " + r);
+                for (Resource rr : g.getObjects(r, l0.ConsistsOf)) {
+                	if (!g.isInstanceOf(rr, l0.String))
+                		fail("Resource " + rr + " is not instance of String.");
+                	if (!g.isInstanceOf(rr, l0.Entity))
+                		fail("Resource " + rr + " is not instance of Entity.");
+                }
+            }
+        }
+    }
+}