Control Plane Policing not working on 1841 Router

Hi, I am following the following article for control plane policing but am finding it is not actually working:
https://www.micronicstraining.com/a-real-world-scenario-for-copp/

Specifically i am trying to block fragments from coming to control plane. I have simplified this a bit but find it is not working:

IP access-list extended BANFRAG
    10 permit icmp any any fragments
Class Map match-all CM_BANFRAG
   Match access-group name BANFRAG
Policy Map newCoPP
    Class CM_BANFRAG
      drop
control-plane
 service-policy input newCoPP

If i send an ICMP packet that is oversize it will break it up and still go through and sh policy-map control-plane shows no hits. If i take that same ACL and apply as access group on the interface of router it will block the oversized icmp packet (as desired) and see acl increment by one. But when applied like above to control plane it is NOT blocking it?
Psy4HAAsked:
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Psy4HAConnect With a Mentor Author Commented:
This looks to be a bug i have iOS 12.4(25) doesn't happen in 12.4(5a) apparently. Odd.
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Psy4HAAuthor Commented:
This looks to be a bug i have iOS 12.4(25) doesn't happen in 12.4(5a)
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