Router's NTP server only listening on IPv6, yet IPv4 queries still work

[Bozdw]

Running

netstat -tunpl | grep ntp

only returns

udp 0 0 :::123 :::* 7216/ntp

yet I am able to successfully execute this command on a IPv4-only Windows client:

w32tm /stripchart /computer:192.168.1.1 /samples:5
Tracking 192.168.1.1 [192.168.1.1:123].
Collecting 5 samples.
The current time is 1/5/2023 4:44:28 PM.
16:44:28, d:+00.0008360s o:+00.6298746s [ | * ]
16:44:30, d:+00.0007364s o:+00.6299281s [ | * ]
16:44:32, d:+00.0007405s o:+00.6299804s [ | * ]
16:44:34, d:+00.0006780s o:+00.6300335s [ | * ]
16:44:36, d:+00.0007253s o:+00.6300372s [ | * ]

Can someone enlighten me?