"No database selected" when using CTE in a subquery of DELETE statement

create database x;

use x;

create table t (i int);

insert into t values (1);

delete from x.t

where x.t.i in (

  with u (i) as (

    select 1

  )

  select i

  from u

);

SQL Error [1046] [3D000]: (conn:77) No database selected

select *

from x.t

where x.t.i in (

  with u (i) as (

    select 1

  )

  select i

  from u

);

delete from x.t

where x.t.i in (

  select i

  from (select 3 i) u

);