LP:825095 - Wrong result with materialization and NOT IN with 2 expressions

The following query:

SELECT *
FROM t1
WHERE (a, b ) NOT IN (
 SELECT a , b
 FROM t2
);

does not return any rows when executed with materialization, even though it should return

 a | b
--+--
 4 | 4
 4 | 2
(2 rows)

explain:

minimal optimizer switch: in_to_exists=off,materialization=on

full optimizer_switch:

index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=on,in_to_exists=off,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on

test case:

CREATE TABLE t1 (a int,b int);
INSERT INTO t1 VALUES (4,4),(4,2);

CREATE TABLE t2 (b int, a int);
INSERT INTO t2 VALUES (4,3),(8,4);

SET SESSION optimizer_switch='in_to_exists=off,materialization=on';

SELECT *
FROM t1
WHERE (a, b ) NOT IN (
 SELECT a , b
 FROM t2
);

Repeatable in maria-5.3. Not repeatable in maria-5.2, mysql-5.5 . Does not involve NULLs, empty tables, empty subqueries or constant tables. Seems the particular values in the tables are significant.