pfSense

It seems it would be better to be able to assign a subnet to the OpenVPN network beyond a /64 when using the drop down, rather than defining what the WAN interface has for a PD, as this should be known from other settings available.

This would, however, greatly help with OpenVPN and IPv6 delivered via DHCPv6 PD.

Yeah, I brought this up on the forum a little bit ago, for more context: https://forum.netgate.com/topic/199185/openvpn-with-ipv6-delegated-prefix

In ipv6 land, pretty much all network subnets are /64s, unless you're doing a weird point-to-point link (i.e. a /127), but most hosts receiving an IP address will assume it's on a /64 boundary. This is the way router advertisements work as well. You're never going to have a subnet that's, say, a /68 or something, even though it's technically possible to configure.

Oh, I'm actively using this at home, so if there are any diagnostics you need or anything, let me know. (I'm due to move in a month or so, to the land of Zayo Fiber, and they may do things differently). I may also attempt to upgrade to 26.03 and confirm it reapplies clean.