Not exists OID ifIn/OutOctets in ROS v5beta6

Hi.
In ROS v5beta6 snmpwalk not worked:
..~# snmpwalk -v 2c -c .1.3.6.1.2.1.2.2.1.10.1 return:
IF-MIB::ifInOctets.1 = No Such Instance currently exists at this OID

But in ROS v5beta5 is fine worked:
..~# snmpwalk -v 2c -c .1.3.6.1.2.1.2.2.1.10.1 return:
IF-MIB::ifInOctets.1 = Counter32: 2528870151

It`s a feature, or bug?

Bug to be fixed in beta7 according to the beta6 thread.