LP:670417 - Diverging results in maria-5.3-mwl128-dsmrr-cpk with join buffer (incremental, BKA join)

The following query

SELECT table2.col_varchar_key FROM t2 STRAIGHT_JOIN ( t1 AS table2 JOIN t1 AS table3 ON table3.pk ) ON table3.col_varchar_key = table2.col_varchar_key AND table3.col_varchar_key = table2.col_varchar_nokey ;

Returns 999 rows when executed with BKA in maria-5.3-mwl128-dsmrr-cpk . All other execution plans and trees (maria-5.3 and maria-5.3-mwl128) agree that the query should return 1000 rows.