main.desc_index_range fails in bb, result length mismatch

main.desc_index_range 'innodb'           w4 [ fail ]

        Test ended at 2022-03-01 11:23:04

CURRENT_TEST: main.desc_index_range

--- D:/winx64-packages/build/src/mysql-test/main/desc_index_range.result	2022-03-01 10:22:18.000000000 +0000

+++ D:\winx64-packages\build\src\mysql-test\main\desc_index_range.reject	2022-03-01 11:23:04.506052100 +0000

@@ -207,7 +207,7 @@

 # Must use ROR-intersect:

 explain select * from t1 where b = 255 AND a IS NULL;

 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

-1	SIMPLE	t1	index_merge	a,b	b,a	5,5	NULL	1	Using intersect(b,a); Using where; Using index

+1	SIMPLE	t1	ref	a,b	b	5	const	2	Using where

 select * from t1 where b = 255 AND a IS NULL;

 pk	a	b

 10000	NULL	255

mysqltest: Result length mismatch