Defender System Config Change to Firewall Port

A few weeks ago Windows Defender started alerting me to a firewall change at boot up. The message is:

DETECTED CHANGES:
New: 67:UDP:*:EnabledHCP Discovery Service
Original: 67:UDP:0.0.0.0/255.255.255.255:EnabledHCP Discovery Service

firewallport (Changed)
HKLM\System\CurrentControlSet\Services\SharedAccess\Parametrers\FirewallPolicy\StandardProfile\GloballyOpenPorts\List\\67:UDP

I don't know what's causing the change. Both new and original look effectively the same, but something at boot up is changing the format. Anyone have an idea as to what can cause this? Several auto updates had occurred and I suspect one of them may have done this but I don't know which. I would at least like to stop the annoying alerts. Appreciate any thoughts.