Hi Adam,
Can you confirm whether below feature configured in your router
Feature: OAL (Optimized access-list)
command: mls rate-limit unicast ip icmp unreachable acl-drop 0
This will prevent counters generated in deny statement because packets will be processed in hardware
if so please issue below global command
"no mls rate-limit unicast ip icmp unreachable acl-drop 0" and see progress of counters in deny statement.
Please let me know if this is useful to you.
Regards
Mahesh