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The original was posted on /r/ipv6 by /u/Kentzo on 2023-06-30 05:30:44+00:00.

RFC3633 says

the requesting router MUST NOT assign any delegated prefixes
or subnets from the delegated prefix(es) to the link through
which it received the DHCP message from the delegating router

Later the PD_EXCLUDE option was added to allow this. But why was this required in the first place?