@Entity
@Table(name = "ENTITY_A")
@DiscriminatorColumn(name = "DISC_COL", discriminatorType = DiscriminatorType.INTEGER)
@FilterDef(name = "DUMMY_FILTER", defaultCondition = "(ID IS NOT NULL)")
@Filter(name = "DUMMY_FILTER")
public abstract class AbstractEntityA {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	@Column(name = "ID")
	Integer id;

}

@Entity
@DiscriminatorValue("1")
public class EntityAChildOne extends AbstractEntityA {}

@Entity
@DiscriminatorValue("2")
public class EntityAChildTwo extends AbstractEntityA {}

	@Override
	protected void configure(Configuration configuration) {
		super.configure(configuration);

		configuration.setProperty(AvailableSettings.SHOW_SQL, Boolean.TRUE.toString());
		configuration.setProperty(AvailableSettings.FORMAT_SQL, Boolean.TRUE.toString());
		configuration.setProperty(AvailableSettings.DEFAULT_SCHEMA, "PUBLIC");
	}

	@Test
	public void hhhXXXXTest() throws Exception {
		try (Session s = openSession()) {
			Transaction tx = s.beginTransaction();
			EntityAChildOne entityAChildOne = new EntityAChildOne();
			EntityAChildTwo entityAChildTwo = new EntityAChildTwo();

			s.persist(entityAChildOne);
			s.persist(entityAChildTwo);
			tx.commit();
		}

		try (Session s = openSession()) {
			Transaction tx = s.beginTransaction();
			s.enableFilter("DUMMY_FILTER");
			MutationQuery deleteQuery = s.createMutationQuery("delete from org.hibernate.bugs.EntityAChildTwo");
			int actual = deleteQuery.executeUpdate();
			assertThat(actual).isEqualTo(1);
			tx.commit();

			Query<AbstractEntityA> query = s.createQuery("select c from org.hibernate.bugs.AbstractEntityA c",
					AbstractEntityA.class);
			List<AbstractEntityA> actualList = query.list();

			assertThat(actualList).hasSize(1);
		}
	}

Hibernate: 
    delete 
    from
        PUBLIC.ENTITY_A 
    where
        DISC_COL=2 
        and (
            ID IS NOT NULL
        )

java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "key" is null
	at java.base/java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
	at org.hibernate.metamodel.model.domain.internal.MappingMetamodelImpl.findEntityDescriptor(MappingMetamodelImpl.java:411)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.registerEntityNameUsage(BaseSqmToSqlAstConverter.java:2973)
	at org.hibernate.internal.FilterHelper.render(FilterHelper.java:232)
	at org.hibernate.internal.FilterHelper.generateFilterPredicate(FilterHelper.java:180)
	at org.hibernate.internal.FilterHelper.applyEnabledFilters(FilterHelper.java:158)
	at org.hibernate.persister.entity.AbstractEntityPersister.applyFilterRestrictions(AbstractEntityPersister.java:3042)
	at org.hibernate.persister.entity.AbstractEntityPersister.applyBaseRestrictions(AbstractEntityPersister.java:3059)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.consumeFromClauseRoot(BaseSqmToSqlAstConverter.java:2776)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at org.hibernate.query.sqm.tree.from.SqmFromClause.visitRoots(SqmFromClause.java:80)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitFromClause(BaseSqmToSqlAstConverter.java:2542)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQuerySpec(BaseSqmToSqlAstConverter.java:2028)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQuerySpec(BaseSqmToSqlAstConverter.java:433)
	at org.hibernate.query.sqm.tree.select.SqmQuerySpec.accept(SqmQuerySpec.java:122)
	at org.hibernate.query.sqm.spi.BaseSemanticQueryWalker.visitQueryPart(BaseSemanticQueryWalker.java:221)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQueryPart(BaseSqmToSqlAstConverter.java:1890)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelectStatement(BaseSqmToSqlAstConverter.java:1575)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelectStatement(BaseSqmToSqlAstConverter.java:433)
	at org.hibernate.query.sqm.tree.select.SqmSelectStatement.accept(SqmSelectStatement.java:222)
	at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.translate(BaseSqmToSqlAstConverter.java:768)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.buildCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:344)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.withCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:267)
	at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.performList(ConcreteSqmSelectQueryPlan.java:243)
	at org.hibernate.query.sqm.internal.QuerySqmImpl.doList(QuerySqmImpl.java:518)
	at org.hibernate.query.spi.AbstractSelectionQuery.list(AbstractSelectionQuery.java:367)
	at org.hibernate.bugs.ORMUnitTestCase.hhh16435Test(ORMUnitTestCase.java:85)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.hibernate.testing.junit4.ExtendedFrameworkMethod.invokeExplosively(ExtendedFrameworkMethod.java:45)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.lang.Thread.run(Thread.java:833)