DHCPv4 not handing out AGH's ipv6 address in leases?

[cbc02009]

I have SLAAC setup on my network using a prefix delegation from my ISP. AdGuardHome is listening on it's ipv6 addresses, but the addresses are not being handed out as port of the DHCP leases. I'm not super familiar with the technology, is this because it can't be done, or is it possible I have something misconfigured?

I'm running v0.107.7 on arch linux. Here's my config:

bind_host: 0.0.0.0
bind_port: 80
beta_bind_port: 0
users:
- name: chris
  password: $2a$10$jc/X0AKZeU.7xfwd5DF8/O4U/rJ0NprZU1KMVKsNwrfIqX1Wpjq2W
auth_attempts: 5
block_auth_min: 15
http_proxy: ""
language: ""
debug_pprof: false
web_session_ttl: 720
dns:
  bind_hosts:
  - 0.0.0.0
  port: 53
  statistics_interval: 1
  querylog_enabled: true
  querylog_file_enabled: true
  querylog_interval: 2160h
  querylog_size_memory: 1000
  anonymize_client_ip: false
  protection_enabled: true
  blocking_mode: default
  blocking_ipv4: ""
  blocking_ipv6: ""
  blocked_response_ttl: 10
  parental_block_host: family-block.dns.adguard.com
  safebrowsing_block_host: standard-block.dns.adguard.com
  ratelimit: 20
  ratelimit_whitelist: []
  refuse_any: true
  upstream_dns:
  - https://dns-unfiltered.adguard.com/dns-query
  - '[/lan/]10.0.0.18'
  upstream_dns_file: ""
  bootstrap_dns:
  - 9.9.9.10
  - 149.112.112.10
  - 2620:fe::10
  - 2620:fe::fe:10
  all_servers: false
  fastest_addr: false
  fastest_timeout: 1s
  allowed_clients: []
  disallowed_clients: []
  blocked_hosts:
  - version.bind
  - id.server
  - hostname.bind
  trusted_proxies:
  - 127.0.0.0/8
  - ::1/128
  cache_size: 4194304
  cache_ttl_min: 0
  cache_ttl_max: 0
  cache_optimistic: false
  bogus_nxdomain: []
  aaaa_disabled: false
  enable_dnssec: false
  edns_client_subnet: false
  max_goroutines: 300
  ipset: []
  filtering_enabled: true
  filters_update_interval: 24
  parental_enabled: false
  safesearch_enabled: false
  safebrowsing_enabled: false
  safebrowsing_cache_size: 1048576
  safesearch_cache_size: 1048576
  parental_cache_size: 1048576
  cache_time: 30
  rewrites: []
  blocked_services: []
  upstream_timeout: 10s
  private_networks: []
  use_private_ptr_resolvers: true
  local_ptr_upstreams: []
tls:
  enabled: false
  server_name: ""
  force_https: false
  port_https: 443
  port_dns_over_tls: 853
  port_dns_over_quic: 853
  port_dnscrypt: 0
  dnscrypt_config_file: ""
  allow_unencrypted_doh: false
  strict_sni_check: false
  certificate_chain: ""
  private_key: ""
  certificate_path: ""
  private_key_path: ""
filters:
- enabled: true
  url: https://adguardteam.github.io/AdGuardSDNSFilter/Filters/filter.txt
  name: AdGuard DNS filter
  id: 1
- enabled: false
  url: https://adaway.org/hosts.txt
  name: AdAway Default Blocklist
  id: 2
- enabled: true
  url: https://raw.githubusercontent.com/crazy-max/WindowsSpyBlocker/master/data/hosts/spy.txt
  name: WindowsSpyBlocker - Hosts spy rules
  id: 1656073210
- enabled: true
  url: https://abp.oisd.nl/basic/
  name: OISD Blocklist Basic
  id: 1656073211
- enabled: true
  url: https://someonewhocares.org/hosts/zero/hosts
  name: Dan Pollock's List
  id: 1656073212
- enabled: true
  url: https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Alternate%20versions%20Anti-Malware%20List/AntiMalwareAdGuardHome.txt
  name: Dandelion Sprout's Anti-Malware List
  id: 1656073213
whitelist_filters: []
user_rules:
- '@@||tracker.sktorrent.net^$important'
- ""
dhcp:
  enabled: true
  interface_name: eth0
  local_domain_name: lan
  dhcpv4:
    gateway_ip: 10.0.0.1
    subnet_mask: 255.224.0.0
    range_start: 10.0.1.0
    range_end: 10.0.1.255
    lease_duration: 86400
    icmp_timeout_msec: 1000
    options: []
  dhcpv6:
    range_start: ""
    lease_duration: 86400
    ra_slaac_only: true
    ra_allow_slaac: false
clients:
  runtime_sources:
    whois: true
    arp: true
    rdns: true
    dhcp: true
    hosts: true
  persistent: []
log_compress: false
log_localtime: false
log_max_backups: 0
log_max_size: 100
log_max_age: 3
log_file: ""
verbose: false
os:
  group: ""
  user: ""
  rlimit_nofile: 0
schema_version: 14