Cloudflare API discards IP hints for HTTPS records

I try to update my existing HTTPS record and set ipv4hint and ipv6hint:

curl -X PATCH "https://api.cloudflare.com/client/v4/zones/${ZONE_ID}/dns_records/${RECORD_ID}" \
     -H "Authorization: Bearer ${TOKEN}" \
     -H "Content-Type: application/json" \
     --data '{"type":"HTTPS","content":"1 . alpn=\"h3,h3-29,h3-28,h3-27,h2\" ipv4hint=\"'${IPV4}'\" ipv6hint=\"'${IPV6}'\""}'

The call itself completes without an error but has no ipv4hint or ipv6hint:

"type":"HTTPS","content":"1 . alpn=\"h3,h3-29,h3-28,h3-27,h2\""
"data":{"priority":1,"target":".","value":"alpn=\"h3,h3-29,h3-28,h3-27,h2\""}
"success":true,"errors":[],"messages":[]}

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