CREATE VIEW extraction changes COUNT(*) result for ordered grouped VAR_SAMP(... ) IS NULL query

CREATE TABLE t1_case06 (

  c1 INT NOT NULL,

  c6 VARCHAR(10) NOT NULL

) DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci;

INSERT INTO t1_case06 VALUES

  (2323, 'sample_s'),

  (3269, 'sample_S'),

  (143, 'sample_3Bs');

CREATE INDEX idx_c6 ON t1_case06 (c6);

-- Source Original SQL

SELECT COUNT(*) AS col_1

FROM (

  SELECT c6, VAR_SAMP(c1) AS v

  FROM t1_case06

  GROUP BY c6

  ORDER BY c6 DESC

) q

WHERE v IS NULL;

-- View SQL

CREATE VIEW v_case06 AS

SELECT c6, VAR_SAMP(c1) AS v

FROM t1_case06

GROUP BY c6;

-- Mutated SQL

SELECT COUNT(*) AS col_1

FROM (

  SELECT c6, v

  FROM v_case06

  ORDER BY c6 DESC

) q

WHERE v IS NULL;