innodb.ibuf_not_empty failed in buildbot

innodb.ibuf_not_empty 'innodb,strict_crc32' w4 [ fail ]

        Test ended at 2020-10-24 09:56:28

CURRENT_TEST: innodb.ibuf_not_empty

--- D:/winx64-debug/build/src/mysql-test/suite/innodb/r/ibuf_not_empty.result	2020-10-24 09:40:27.610487900 +0000

+++ D:\winx64-debug\build\src\mysql-test\suite\innodb\r\ibuf_not_empty.reject	2020-10-24 09:56:28.715051700 +0000

@@ -9,7 +9,7 @@

 # restart: --innodb-force-recovery=6 --innodb-change-buffer-dump

 check table t1;

 Table	Op	Msg_type	Msg_text

-test.t1	check	Warning	InnoDB: Index 'b' contains 990 entries, should be 1024.

+test.t1	check	Warning	InnoDB: Index 'b' contains 991 entries, should be 1024.

 test.t1	check	error	Corrupt

 # restart

 SET GLOBAL innodb_fast_shutdown=0;

mysqltest: Result content mismatch