IPv6 and snmptrapd not processing traps

It looks like I got the syntax right a while back and its listening, but not processing the traps...
Any ideas on why?
I've used udp6:162, and udp6[address]:162 w/ the same result. Nothing.
This is a RHEL 6.6 box.
IPv4 traps on another NIC are processed.
Debug output didn't show anything that caught my eye.

# ps -ef | grep snmptrapd | grep -v grep
root 14576 1 0 20:35 ? 00:00:00 /usr/sbin/snmptrapd -a -A -Lf /var/log/snmtrapd.log -On -p /var/run/snmptrapd.pid udp:162,udp6:[::1]:162

# netstat -an | grep ":162 "
udp 0 0 0.0.0.0:162 0.0.0.0:*
udp 0 0 ::1:162 :::*

# tcpdump -i eth3 -s 0 port 162
tcpdump: WARNING: eth3: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth3, link-type EN10MB (Ethernet), capture size 65535 bytes

20:54:19.444292 IP6 2001:4888:a03:311f:c0:a:0:190.32861 > txslm2mlnag001v6.snmptrap: C=sp1der Trap(167) E:232 0.0.0.0 enterpriseSpecific s=11003 78131151 system.sysName.0="TXSLM2MCHP7004-OA" E:232.11.2.11.1=1 E:232.11.2.8.1="HP Onboard Administrator Test Trap sent from enclosure: TXSLM2MCHP7004"

# cat /var/log/snmtrapd.log
NET-SNMP version 5.5

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