Dear SQLite Developers,

I meet a wrong result. Please see the below cases. I can reproduce it on the version SQLite version SQLite version 3.50.0 and the latest Check-in [7d884386be].

CREATE TABLE t0(c0, c1, c2);
CREATE TABLE t1 (c0);
CREATE VIRTUAL TABLE t2 USING rtree(c0, c1, c2);
CREATE TABLE v0(c0);
INSERT INTO t2(c0) VALUES ('');
INSERT INTO t1 VALUES ('0.0');

SELECT t1.c0, v0.* FROM  t2 NATURAL LEFT JOIN t0 NATURAL JOIN t1 FULL JOIN v0 ON 1;
-- empty result
-- expected result: 0.0, NULL