em0 WOL not working in 15.1 (82579LM)

Hi,

I have a machine which was running TrueNAS with FreeBSD 13.1 and it used WOL to wake up sometimes to do backups.

I now upgraded the machine to 15.1 and installed Sylve and some other tools to do backups. All fine, but WOL does not work anymore.

It is this machine: https://dmesgd.nycbug.org/dmesgd?do=view&id=9019.

The network adapter is em0.
em0: <Intel(R) 82579LM> port 0xf080-0xf09f mem 0xf7d00000-0xf7d1ffff,0xf7d39000-0xf7d39fff irq 20 at device 25.0 on pci0
em0: EEPROM V0.13-4
em0: Using 1024 TX descriptors and 1024 RX descriptors
em0: Using an MSI interrupt
em0: Ethernet address: [_MAC_XXXXXXXXXX]
em0: netmap queues/slots: TX 1/1024, RX 1/1024
 ifconfig shows WOL_MAGIC is enabled, and I didn't change anything in the BIOS when I upgraded to 15.1. Any thoughts on this?
NB: I have another Dell machine with em0 ("em0: <Intel(R) I219-LM SPT(5)>") which does WOL fine. (https://dmesgd.nycbug.org/dmesgd?do=view&id=9017)

Regards,
Ronald.