diff --git a/hibernate-core/src/main/java/org/hibernate/resource/beans/container/internal/JpaCompliantLifecycleStrategy.java b/hibernate-core/src/main/java/org/hibernate/resource/beans/container/internal/JpaCompliantLifecycleStrategy.java
index 20ca55aeff..2b48c40f6e 100644
--- a/hibernate-core/src/main/java/org/hibernate/resource/beans/container/internal/JpaCompliantLifecycleStrategy.java
+++ b/hibernate-core/src/main/java/org/hibernate/resource/beans/container/internal/JpaCompliantLifecycleStrategy.java
@@ -223,6 +223,20 @@ public class JpaCompliantLifecycleStrategy implements BeanLifecycleStrategy {
 				return;
 			}
 
+			if ( beanManager == null ) {
+				try {
+					beanInstance = fallbackProducer.produceBeanInstance( beanType );
+					return;
+				}
+				catch (Exception e) {
+					// the CDI BeanManager is not know to be ready for use and the
+					// fallback-producer was unable to create the bean...
+					throw new IllegalStateException(
+							"CDI BeanManager is not known to be ready for use and the fallback-producer was unable to create the bean",
+							new NotYetReadyException( e )
+					);
+				}
+			}
 
 			try {
 				this.creationalContext = beanManager.createCreationalContext( null );
diff --git a/hibernate-core/src/test/java/org/hibernate/orm/test/cdi/lifecycle/ExtendedBeanManagerNotAvailableDuringCustomUserTypeInitTest.java b/hibernate-core/src/test/java/org/hibernate/orm/test/cdi/lifecycle/ExtendedBeanManagerNotAvailableDuringCustomUserTypeInitTest.java
new file mode 100644
index 0000000000..b405179518
--- /dev/null
+++ b/hibernate-core/src/test/java/org/hibernate/orm/test/cdi/lifecycle/ExtendedBeanManagerNotAvailableDuringCustomUserTypeInitTest.java
@@ -0,0 +1,153 @@
+/*
+ * Hibernate, Relational Persistence for Idiomatic Java
+ *
+ * License: GNU Lesser General Public License (LGPL), version 2.1 or later
+ * See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
+ */
+package org.hibernate.orm.test.cdi.lifecycle;
+
+import jakarta.enterprise.inject.spi.BeanManager;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import org.hibernate.HibernateException;
+import org.hibernate.annotations.Type;
+import org.hibernate.boot.MetadataSources;
+import org.hibernate.boot.registry.StandardServiceRegistry;
+import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
+import org.hibernate.cfg.AvailableSettings;
+import org.hibernate.engine.spi.SharedSessionContractImplementor;
+import org.hibernate.resource.beans.container.spi.ExtendedBeanManager;
+import org.hibernate.testing.TestForIssue;
+import org.hibernate.usertype.DynamicParameterizedType;
+import org.hibernate.usertype.UserType;
+import org.junit.jupiter.api.Test;
+
+import java.io.Serializable;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Types;
+import java.util.Properties;
+
+@TestForIssue(jiraKey = "HHH-16096")
+public class ExtendedBeanManagerNotAvailableDuringCustomUserTypeInitTest {
+
+	@Test
+	public void tryIt() {
+		// pass ExtendedBeanManager but never initialize it
+		final StandardServiceRegistry ssr = new StandardServiceRegistryBuilder()
+				.applySetting( AvailableSettings.JAKARTA_CDI_BEAN_MANAGER, new ExtendedBeanManagerImpl() )
+				.build();
+
+		// this will trigger initialization of dynamic parameterized user type bean
+		//noinspection EmptyTryBlock
+		try (var ignored = new MetadataSources(ssr)
+				.addAnnotatedClass(TheEntity.class)
+				.buildMetadata()
+				.buildSessionFactory()) {
+		}
+		finally {
+			StandardServiceRegistryBuilder.destroy(ssr);
+		}
+	}
+
+	@SuppressWarnings("JpaDataSourceORMInspection")
+	@Entity(name = "TheEntity")
+	@Table(name = "TheEntity")
+	public static class TheEntity {
+		@Id
+		private Integer id;
+		private String name;
+
+		@Type(CustomDynamicParameterizedUserType.class)
+		private String custom;
+	}
+
+	public static class CustomDynamicParameterizedUserType implements UserType<Object>, DynamicParameterizedType {
+
+		@Override
+		public int getSqlType() {
+			return Types.VARCHAR;
+		}
+
+		@Override
+		public Class<Object> returnedClass() {
+			return Object.class;
+		}
+
+		@Override
+		public boolean equals(Object x, Object y) throws HibernateException {
+			if (x == null) {
+				return y == null;
+			} else {
+				return x.equals(y);
+			}
+		}
+
+		@Override
+		public int hashCode(Object x) throws HibernateException {
+			return x == null ? 0 : x.hashCode();
+		}
+
+		@Override
+		public Object nullSafeGet(ResultSet rs, int i, SharedSessionContractImplementor sharedSessionContractImplementor, Object o) throws SQLException {
+			String xmldoc = rs.getString(i);
+			return rs.wasNull() ? null : xmldoc;
+		}
+
+		@Override
+		public void nullSafeSet(PreparedStatement st, Object value, int index, SharedSessionContractImplementor session) throws HibernateException, SQLException  {
+			if (value == null) {
+				st.setNull(index, Types.OTHER);
+			} else {
+				st.setObject(index, value, Types.OTHER);
+			}
+		}
+
+		@Override
+		public Object deepCopy(Object value) throws HibernateException {
+			return value;
+		}
+
+		@Override
+		public boolean isMutable() {
+			return false;
+		}
+
+		@Override
+		public Serializable disassemble(Object value) throws HibernateException {
+			return (String) value;
+		}
+
+		@Override
+		public Object assemble(Serializable cached, Object owner) throws HibernateException {
+			return cached;
+		}
+
+		@Override
+		public Object replace(Object original, Object target, Object owner) throws HibernateException {
+			return original;
+		}
+
+		@Override
+		public void setParameterValues(Properties parameters) {
+			// nothing
+		}
+	}
+
+	public static class ExtendedBeanManagerImpl implements ExtendedBeanManager {
+		private LifecycleListener lifecycleListener;
+
+		@Override
+		public void registerLifecycleListener(LifecycleListener lifecycleListener) {
+			assert this.lifecycleListener == null;
+			this.lifecycleListener = lifecycleListener;
+		}
+
+		// not called
+		public void notify(BeanManager ready) {
+			lifecycleListener.beanManagerInitialized( ready );
+		}
+	}
+}