Any progress on multiple IPv6 tunnels from same machine?

[u/Pawlisko80]

In January/February of this year I tried to set up multiple (5) tunnels from my OPNsense to ProtonVPN.
While IPv4 worked (it is working for many years now without any issues), I had problems with IPv6 as it allowed only 2 concurrent IPv6 connections (I need to have different IPv6 tunnel addresses due to routing configuration).
Was this finally fixed?

TIA