Vectorized PTF with count and distinct over partition producing incorrect results.

CREATE TABLE bigd781b_new (
  id int,
  txt1 string,
  txt2 string,
  cda_date int,
  cda_job_name varchar(12));

INSERT INTO bigd781b_new VALUES 
  (1,'2010005759','7164335675012038',20200528,'load1'),
  (2,'2010005759','7164335675012038',20200528,'load2');

SELECT
    txt1,
    txt2,
    count(distinct txt1) over(partition by txt1) as n,
    count(distinct txt2) over(partition by txt2) as m
FROM bigd781b_new

+-------------+-------------------+----+----+
|    txt1     |       txt2        | n  | m  |
+-------------+-------------------+----+----+
| 2010005759  | 7164335675012038  | 2  | 2  |
| 2010005759  | 7164335675012038  | 2  | 2  |
+-------------+-------------------+----+----+

+-------------+-------------------+----+----+
|    txt1     |       txt2        | n  | m  |
+-------------+-------------------+----+----+
| 2010005759  | 7164335675012038  | 1  | 1  |
| 2010005759  | 7164335675012038  | 1  | 1  |
+-------------+-------------------+----+----+