JSON aggregate calls with different null clause get incorrectly merged during converting from SQL to relational algebra

WITH tab(x) AS (VALUES 1, 2, 1, CAST(NULL AS INTEGER))
SELECT JSON_ARRAYAGG(x), JSON_ARRAYAGG(x NULL ON NULl) FROM tab

EXPR$0  |EXPR$1  |
--------|--------|
[1,2,1] |[1,2,1] |

EXPR$0  |EXPR$1  |
--------|--------|
[1,2,1] |[1,2,1,null] |