SQL_MODE=ORACLE for INTERSECT doesn't work for view

set SQL_MODE=ORACLE;

create table t12(c1 int);

insert into t12 values(1);

insert into t12 values(2);

create table t13(c1 int);

insert into t13 values(1);

insert into t13 values(3);

create table t234(c1 int);

insert into t234 values(2);

insert into t234 values(3);

insert into t234 values(4);

create view v1 as select * from t13 union select * from t234 intersect select * from t12;

select * from v1;

drop view v1;

drop table t12,t13, t234;

c1

1

2

c1

1

3

2