SHOW ENGINE INNODB STATUS has two TRANSACTIONS sections

Verified with PS 5.6.21

nilnandan@desktop:~$ mysql -uroot -p
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Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 37
Server version: 5.6.21-70.1 Percona Server (GPL), Release 70.1, Revision 698

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mysql> show engine innodb status \G
*************************** 1. row ***************************
  Type: InnoDB
  Name:
Status:
=====================================
2014-12-31 13:29:23 7ff2e009f700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 25 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 1 srv_active, 0 srv_shutdown, 21600 srv_idle
srv_master_thread log flush and writes: 21598
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3
OS WAIT ARRAY INFO: signal count 3
Mutex spin waits 60, rounds 140, OS waits 1
RW-shared spins 2, rounds 60, OS waits 2
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 2.33 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 4868
Purge done for trx's n:o < 2917 undo n:o < 0 state: running but idle
History list length 26
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 37, OS thread handle 0x7ff2e009f700, query id 110 localhost root init
show engine innodb status
--------
FILE I/O
--------
..
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
..
---
LOG
---
..
----------------------
BUFFER POOL AND MEMORY
----------------------
..
--------------
ROW OPERATIONS
--------------
..
------------
TRANSACTIONS
------------
Trx id counter 4868
Purge done for trx's n:o < 2917 undo n:o < 0 state: running but idle
History list length 26
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 37, OS thread handle 0x7ff2e009f700, query id 110 localhost root init
show engine innodb status
----------------------------
END OF INNODB MONITOR OUTPUT
============================

1 row in set (0.01 sec)

mysql>

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-1595