Incorrect NULL value handling for instantly dropped BLOB columns

CREATE TABLE t0 (c1 INT, c2 BLOB) ROW_FORMAT=REDUNDANT;

ALTER TABLE t0 DROP c2;

INSERT INTO t0 (c1) VALUES (0); -- [42000][1118] (conn=10) Row size too large (> 8123). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help. In current row format, BLOB prefix of 768 bytes is stored inline.