Ethernet IPv6 Netgear Nighthawk M6 Pro (MR6450)

I am running firmware NTGX65_10.04.25.00 and notice that WiFi clients have IPv6 working but Ethernet clients have not. I just upgraded the firmware today and only use the device sporadically for work abroad. I bought the device a month ago (for my next work trip next week) and I believe I tested IPv6 did work with previous firmware, but I cannot be sure (since WiFi works when both WiFi and Ethernet are connected so maybe I tested wrong). I tested multiple devices today. Note that an IPv6 address is given and also a link-local default route. But v6 ping and all other v6 tests fail over Ethernet-only (as opposed to over WiFi-only where they succeed). Can someone comment or confirm or deny or test this for similar conditions, please? Thanks.

I can provide wireshark pcap files for working WiFi and not working Ethernet pings