Consider the test case below. It is unexpected that, if the second query returns true, the third query returns an empty result, because the value of the WHERE predicate should be true as well.
I'm not sure if the result of the second query is expected, but if it is, the third query should return -766027665. If removing the PK constraint, the third query returns -766027665, which is expected.

CREATE TABLE t0(c0 INTEGER, PRIMARY KEY(c0)); -- PK is needed
INSERT INTO t0 (c0) VALUES (-766027665);

SELECT t0.c0 FROM t0; -- -766027665
SELECT t0.c0 <= ((-9223372036854775808)||1) FROM t0; -- true
SELECT t0.c0 FROM t0 WHERE t0.c0 <= ((-9223372036854775808)||1);
-- Expected (if true for second query is expected): -766027665
-- Actual: Empty Table

I found this in version LI-T6.0.0.253 where I built from source code f4e725f