in the latest 2.2.2 IPv6 are very stable, might want to keep it another try? also check if have a service called "radvd" running on your pfSense, that's the Router Advertisement Daemon for IPv6.
btw from your setting pages screenshots, I also noticed you using 56 as DHCPv6 prefix delegation size, 56 only for if you asked Snap for an Static IPv6, use 48 if you are not.
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