strange ipfilter's behavior

hey,

after few current cvsup's ipfilter doesnt work properly. Seems none saw 
this problem.
After boot process passed it seems ipfilter rules are not working 
properly (but they're loaded and you can see them via ipfstat -io).
rules themself are applied for tun0 with ppp on it. If I run ipf -Fa -f
/etc/ipf.conf manually ipfilter start working as it ought to.
(same situation with ipnat)

Question is.. i missed something in recent /etc/rc updates or its a bug?
uname -a:
FreeBSD lifebook 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Mon Aug  9 14:35:50 
MSD 2004     root_at_lifebook:/usr/obj/usr/src/sys/LIFEBOOK  i386

/etc/rc.conf:
ipfilter_enable="YES"
ipfilter_program="/sbin/ipf"
ipfilter_rules="/etc/ipf.conf"
ipfilter_flags=""
ipnat_enable="YES"              # Set to YES to enable ipnat functionality
ipnat_program="/sbin/ipnat"     # where the ipnat program lives
ipnat_rules="/etc/ipnat.conf"   # rules definition file for ipnat
ipnat_flags=""                  # additional flags for ipnat
ipmon_enable="YES"
ipmon_program="/sbin/ipmon"     # where the ipfilter monitor program lives
ipmon_flags="-Ds"               # typically "-Ds" or "-D /var/log/ipflog"

/etc/ipf.conf: (pretty ugly)
count out   on tun0 from any to any
count in    on tun0 from any to any

pass out    quick on tun0 proto tcp from any to any keep state
pass out    quick on tun0 proto icmp from any to any keep state
pass out    quick on tun0 proto udp from any to any keep state

block return-icmp in log quick on tun0 proto udp from any to any
block return-icmp(proto-unr) in log quick on tun0 proto icmp from any to any
block return-rst in log quick on tun0 proto tcp from any to any