To be fair, your ISP is both following and not following RFC 4291.
That RFC has a well-known contradiction where section 2.4 defines a
link-local address as an address belonging to fe80::/10 while section
2.5.6 defines it as an address belonging to fe80::/64. In practice I
have only ever seen fe80::/64 be used though. Well that is until now.
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