pfctl eating too much cpu

[zjgn]

I have pfSense running since years without issues. Now I'm trying to get my feet wet with IPv6 and configured it on two interfaces. Since then pfSense has a load average between 7-11 when the network is idle. top shows pfctl as the culprit.

A reboot doesn't fix it. Neither does disabling pfblocker or suricata. Here is the cpu graph:

How to fix this or find out what the issue is?

2.4.5-RELEASE
hw.machine: amd64
hw.model: Intel(R) Atom(TM) CPU D2500   @ 1.86GHz
hw.ncpu: 2

[jimp]

https://forum.netgate.com/post/908806