CARP flipping back and forth between primary and backup since 24.7.8

[Grossartig]

I upgraded to OPNsense 24.7.8-amd64 on both my primary and backup a couple of days ago (sadly I don't remember which version I came from, but the last time I updated was about a month ago or so). Ever since, I am seeing lots of alerts (every few minutes or so) about one of my interfaces having issues. It's always the same interface.

I have currently disabled CARP on my backup box in an attempt to troubleshoot, but the following messages continue:

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2024-11-10T06:22:32-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "MASTER" for vhid 4
2024-11-10T06:22:30-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "BACKUP" for vhid 4
2024-11-10T06:22:28-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "INIT" for vhid 4
2024-11-10T06:22:26-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "MASTER" for vhid 4
2024-11-10T06:22:20-05:00 Notice kernel <6>carp: 4@igb2: BACKUP -> MASTER (master timed out)
2024-11-10T06:22:18-05:00 Notice kernel <6>carp: demoted by -240 to 0 (pfsync bulk done)
2024-11-10T06:22:17-05:00 Notice kernel <6>carp: demoted by 240 to 240 (pfsync bulk start)
2024-11-10T06:22:17-05:00 Notice kernel <6>carp: 4@igb2: INIT -> BACKUP (initialization complete)
2024-11-10T06:22:17-05:00 Notice kernel <6>carp: 4@igb2: MASTER -> INIT (hardware interface up)
2024-11-10T06:22:14-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "BACKUP" for vhid 4
2024-11-10T06:22:05-05:00 Notice kernel <6>carp: 4@igb2: BACKUP -> MASTER (master timed out)
2024-11-10T06:22:03-05:00 Notice kernel <6>carp: demoted by -240 to 0 (interface up)
2024-11-10T06:22:03-05:00 Notice kernel <6>carp: 4@igb2: INIT -> BACKUP (initialization complete)
2024-11-10T06:21:53-05:00 Notice opnsense /usr/local/etc/rc.syshook.d/carp/20-openvpn: Carp cluster member "Virtual Guest IP (192.168.9.1) (4@igb2)" has resumed the state "INIT" for vhid 4
2024-11-10T06:21:52-05:00 Notice kernel <6>carp: demoted by 240 to 240 (interface down)
2024-11-10T06:21:52-05:00 Notice kernel <6>carp: 4@igb2: MASTER -> INIT (hardware interface down)