Why the new version of sudo: sudo-1.7.2p1-13.el5 changed functionality?

Issue

• After patching systems, sudo is being updated from sudo-1.7.2p1-10.el5 to sudo-1.7.2p1-13.el5, now the string together commands in quotes no longer working, this worked on the older version:

$ sudo -i -u user2 "echo hi;pwd"
[sudo] password for user1: 
hi
/var/ntrs/home/user2

• On the newer version getting:

$ sudo -i -u user2 "echo hi;pwd"
[sudo] password for user1: 
-ksh[1]: echo hi;pwd: not found [No such file or directory]

• Is this a bug? There is nothing in the change log that referred to this feature as not being available any longer?