LP:671901 - No rows returned with (flat, BNLH join) in maria-5.3-mwl128

The following query

SELECT table1.col_int_key FROM t1 AS table1 JOIN t2 AS table2 ON table1.col_varchar_10_utf8_key = table2.col_varchar_1024_utf8_key;

returns no rows when executed with (flat, BNLH join) , but returns rows when executed with full table scan and classical nested loop join.