The ONT is not a Layer 3 device and is not providing IPv4 or IPv6 to the home. Service Providers could decide to offer IPv6 without impact to the underlying GPON system.
My posts reflect my best attempt at understanding and do not represent the views of my employer.
I have IPv6 working on my home UFB install - there is no real difference to DSL when it gets to the ISP's network - you will probably find that if your ISP can give you v6 now - you can probably get v6 on your UFB connection.
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