Description:
------------
$pdo->exec($focusSql); // works correct
$pdo->prepare($focusSql)->execute(); // error

Test script:
---------------
$focusSql = <<<'SQL'
    select '\', '{"x":1}'::jsonb
SQL;

$pdo->exec($focusSql) !== false and print("1 OK\n");

$pdo->prepare(<<<'SQL'
    select '\\', '{"x":1}'::jsonb
SQL)->execute() and print("2 OK\n");

$pdo->prepare(<<<'SQL'
    select '\', '{"x":"foo"}'::jsonb
SQL)->execute() and print("3 OK\n");

$pdo->prepare(<<<'SQL'
    select '\', '{"x":1}'
SQL)->execute() and print("4 OK\n");

$pdo->prepare($focusSql)->execute() and print("5 OK\n");

Expected result:
----------------
1 OK
2 OK
3 OK
4 OK
5 OK

Actual result:
--------------
1 OK
2 OK
3 OK
4 OK
PDOException: SQLSTATE[22P02]: Invalid text representation: 7 ERROR:  invalid input syntax for type json
LINE 1:     select '\', '{"x"$1}'::jsonb
                        ^
DETAIL:  Token "$" is invalid.