IS TRUE incorrectly converts outer join to inner

CREATE TABLE t0(c0 REAL);

CREATE TABLE t1 LIKE t0;

INSERT INTO t1 VALUES (1);

INSERT INTO t0 VALUES (1);

SET @a = false;

PREPARE prepare_query FROM "SELECT t1.c0, t0.c0 FROM t1 LEFT JOIN t0 ON 'J' WHERE (? OR ((t0.c0 IS TRUE) IN ('*_')))";

EXECUTE prepare_query USING @a;

--- c0      c0

--- 1       NULL

SELECT t1.c0, t0.c0 FROM t1 LEFT JOIN t0 ON FALSE WHERE (FALSE OR ((t0.c0 IS TRUE) IN (FALSE)));