Some net.link.bridge entries in sysctl.conf appear ignored after upgrade to 13.0-RELEASE

[Darryn Nicol]

I have the following entries in /etc/sysctl.conf to facilitate the use of
IPFW within VNET jails:

# Only pass IP packets when pfil is enabled
net.link.bridge.pfil_onlyip=0
# Packet filter on the bridge interface
net.link.bridge.pfil_bridge=0
# Packet filter on the member interface
net.link.bridge.pfil_member=0

These worked fine in 12.2-RELEASE but since the upgrade after every reboot
these are all set to 1. If I set them manually they work, but are reset to
1 after another reboot. I have other entries in sysctl.conf that work, did
these sysctls change in 13?