diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/annotations/onetomany/OneToManyWithUnmodifiableSetTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/annotations/onetomany/OneToManyWithUnmodifiableSetTest.java
new file mode 100644
index 000000000000..48711431e002
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/annotations/onetomany/OneToManyWithUnmodifiableSetTest.java
@@ -0,0 +1,102 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.annotations.onetomany;
+
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.Access;
+import jakarta.persistence.AccessType;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.PreUpdate;
+import jakarta.persistence.Transient;
+import org.assertj.core.api.InstanceOfAssertFactories;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Allows testing a collection accessed via a getter that returns a {@link Collections#unmodifiableSet(Set)}
+ *
+ * @author Vincent Bouthinon
+ */
+@DomainModel(
+		annotatedClasses = {
+				OneToManyWithUnmodifiableSetTest.Client.class,
+				OneToManyWithUnmodifiableSetTest.Command.class
+		}
+)
+@SessionFactory
+@JiraKey(value = "HHH-19589")
+public class OneToManyWithUnmodifiableSetTest {
+
+	@Test
+	void test(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			Client client = new Client();
+			Command command = new Command();
+			client.addToCommands( command );
+			session.persist( client );
+			session.persist( command );
+			session.flush();
+			session.clear();
+			Client clientFind = session.find( Client.class, client.id );
+			assertThat( clientFind )
+					.isNotNull()
+					.extracting( Client::getCommands )
+					.asInstanceOf( InstanceOfAssertFactories.COLLECTION )
+					.isNotEmpty();
+		} );
+	}
+
+
+	@Entity(name = "Client")
+	public static class Client {
+		@Transient
+		protected Set<Command> commands = new HashSet<>();
+		@Id
+		@GeneratedValue
+		private Long id;
+
+		@OneToMany
+		@Access(AccessType.PROPERTY)
+		public Set<Command> getCommands() {
+			return Collections.unmodifiableSet( commands );
+		}
+
+		public void setCommands(Set<Command> commands) {
+			this.commands = commands;
+		}
+
+		public void addToCommands(Command command) {
+			this.commands.add( command );
+		}
+
+		/**
+		 * It triggers the {@link org.hibernate.event.internal.DefaultFlushEntityEventListener#copyState} method, because otherwise, if there’s no callbackPreUpdate,
+		 * the system assumes the entity isn’t dirty and doesn’t perform copyState to check for dirtiness.
+		 */
+		@PreUpdate
+		public void preUpdate() {
+		}
+	}
+
+	@Entity(name = "Command")
+	public static class Command {
+
+		@Id
+		@GeneratedValue
+		private Long id;
+	}
+}
diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/mapping/converted/converter/ConverterOverrideTypeRegisttrationTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/mapping/converted/converter/ConverterOverrideTypeRegisttrationTest.java
new file mode 100644
index 000000000000..4718a5007f9f
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/mapping/converted/converter/ConverterOverrideTypeRegisttrationTest.java
@@ -0,0 +1,102 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright Red Hat Inc. and Hibernate Authors
+ */
+package org.hibernate.orm.test.mapping.converted.converter;
+
+import java.util.BitSet;
+
+import org.hibernate.annotations.TypeRegistration;
+import org.hibernate.orm.test.mapping.basic.bitset.BitSetHelper;
+import org.hibernate.orm.test.mapping.basic.bitset.BitSetUserType;
+
+import org.hibernate.testing.orm.junit.DomainModel;
+import org.hibernate.testing.orm.junit.JiraKey;
+import org.hibernate.testing.orm.junit.SessionFactory;
+import org.hibernate.testing.orm.junit.SessionFactoryScope;
+import org.junit.jupiter.api.Test;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Convert;
+import jakarta.persistence.Converter;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * <pre>
+ * The @Converter should take precedence over @TypeRegistration.
+ * This test shows that this is not the case.
+ *
+ * To ensure that the @Converter is taken into account without @TypeRegistration, you just need to remove the @TypeRegistration.
+ * </pre>
+ *
+ * @author Vincent Bouthinon
+ */
+@DomainModel(
+		annotatedClasses = {
+				ConverterOverrideTypeRegisttrationTest.SimpleEntity.class
+		}
+)
+@SessionFactory
+@JiraKey(value = "HHH-19589")
+public class ConverterOverrideTypeRegisttrationTest {
+
+	@Test
+	void test(SessionFactoryScope scope) {
+		scope.inTransaction( session -> {
+			final SimpleEntity object = new SimpleEntity( 77L );
+			BitSet bitSet = new BitSet();
+			bitSet.set( 0, true );
+			object.setBitSet( bitSet );
+			session.persist( object );
+			session.flush();
+			session.clear();
+			SimpleEntity simpleEntity = session.find( SimpleEntity.class, object.id );
+			assertThat( simpleEntity.getBitSet().get( 7 ) ).isTrue();
+		} );
+	}
+
+
+	@Entity(name = "SimpleEntity")
+	@TypeRegistration(basicClass = BitSet.class, userType = BitSetUserType.class) // Remove this annotation to test the use of @Converter
+	public static class SimpleEntity {
+
+		@Id
+		private Long id;
+		@Convert(converter = BitSetConverter.class)
+		private BitSet bitSet;
+
+		public SimpleEntity() {
+		}
+
+		public SimpleEntity(Long id) {
+			this.id = id;
+		}
+
+		public BitSet getBitSet() {
+			return bitSet;
+		}
+
+		public void setBitSet(final BitSet bitSet) {
+			this.bitSet = bitSet;
+		}
+	}
+
+	@Converter
+	public static class BitSetConverter implements AttributeConverter<BitSet, String> {
+
+		@Override
+		public String convertToDatabaseColumn(final BitSet attribute) {
+			return BitSetHelper.bitSetToString( attribute );
+		}
+
+		@Override
+		public BitSet convertToEntityAttribute(final String dbData) {
+			BitSet bitSet = new BitSet();
+			bitSet.set( 7, true );
+			return bitSet;
+		}
+	}
+}