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The following discussion from https://gitlab.isc.org/isc-private/kea-premium/-/merge_requests/112 should be addressed:
The RFC is very loose about this (this explains why you skipped it) but the lease query works with prefix delegation too, for instance:
Query by IPv6 address - This query allows a requestor to request from a server the bindings for a client that either is bound to the address or has been delegated the prefix that contains the address.
Of course even logically you should not assign addresses in a prefix you delegates this raises the question to know if the query is for an address or a prefix. It should have been far clearer / simpler to use a dedicated query type or iaprefix sub option...
I propose to postpone (i.e. another issue or MR) the prefix support. If you agree create a follower and resolve this thread.