DHCPv6 Reply packet with double IAADDR, one has correct preferred-lft one has wrong preferred-lft after RENEW

Hello,

We are the most current version of Kea-2.2.0 stable release.

And we see sometimes double IAADDR packets in the reply DHCPv6 messages coming from Kea after a RENEW It causes the clients to behave strange.

2022-12-01 11:13:53.125 DEBUG [kea-dhcp6.packets/21263.140484500109184] DHCP6_RESPONSE_DATA responding with packet type 7 data is localAddr=[2001:db8:f000:10:16:8:151]:547 remoteAddr=[2001:db9:12::1]:547
msgtype=7(REPLY), transid=0x1ed800
type=00001, len=00010: 00:03:00:01:a8:70:5d:28:47:70
type=00002, len=00014: 00:01:00:01:26:ab:0a:f5:00:0c:29:b5:01:6c
type=00003(IA_NA), len=00068: iaid=1562920816, t1=1800, t2=2880,
options:
  type=00005(IAADDR), len=00024: address=2001:db9:12::15, preferred-lft=3600, valid-lft=7200
**  type=00005(IAADDR), len=00024: address=2001:db9:12::15, preferred-lft=0, valid-lft=0**
type=00017, len=00088: 4491 (uint32),
options:
  type=00034, len=00032: 2001:db8:f000:10:16:8:10 2001:db8:f000:10:101:0:192
  type=00037, len=00016: 2001:db8:f000:10:16:8:151
  type=00038, len=00004: 3600 (int32)
  type=00061, len=00016: 2001:b88:2::
1 relay(s):
relay[0]: msg-type=13(RELAY_REPLY), hop-count=1,
link-address=2001:db9:12::1, peer-address=fe80::aa70:5dff:fe28:4770, 1 option(s)
type=00018, len=00019: 0b:00:00:00:00:20:00:80:14:a8:70:5d:28:47:70:00:00:01:00

How can this behavior explained? It should not be possible to my opinion.