SELECT statement is affected by concurrent transaction under Read Uncommitted

/* init */ DROP TABLE IF EXISTS t;

/* init */ CREATE TABLE t(c1 INT NOT NULL, c2 INT NOT NULL);

/* init */ INSERT INTO t(c1,c2) VALUES (2, 2);

/* t1 */ BEGIN;

/* t2 */ BEGIN;

/* t2 */ INSERT INTO t(c1,c2) VALUES (5, 5);

/* t2 */ SELECT * FROM t; -- [(2, 2), (5, 5)]

/* t1 */ SELECT * FROM t; -- [(2, 2), (5, 5)]

/* t1 */ DELETE FROM t WHERE TRUE; -- blocked

/* t2 */ SELECT * FROM t ; -- [(5, 5)]

/* t2 */ COMMIT; -- t1 unblocked

/* t1 */ COMMIT;