Interesting! Please modify existing filter and add count and log option for icmp and share output of belowmentioned commands
set firewall filter lo-filter term 20 then count ALLOW_ICMP
set firewall filter lo-filter term 20 then log
set firewall filter lo-filter term 30 from protocol icmp
set firewall filter lo-filter term 30 then discard
set firewall filter lo-filter term 30 then count DENY_ICMP
set firewall filter lo-filter term 30 then log
show system statistics icmp
show firewall
show firewall log
show interface filters | no-more