ORA-14300: partitioning key maps to a partition outside maximum permitted number of partitions

create table tq84_tab (
   dt  date,
   id  integer,
   nm  number,
   tx  varchar2(10)
)
partition by range
  (dt) interval (numtoyminterval(1, 'MONTH'))
  (partition p_1 values less than (date '2020-01-01'))
;

insert into tq84_tab values (null, 42, 123.45, 'xxx');