This happens with Beta2 and 3;
LAN-DHCP
Enabling Manual assignment. Having add 3 wired devices (AndroidTV), 1 Wifi Printer, and 1 802.3ad bonded NAS.
Just some samples, but all throught the log, dozens of messages, mix of wired and wireless coming from Router (AX88) or Mesh nodes (AC5300). Devices not even related to the 5 that were manually assigned. Had unrelated wired devices and wireless, of the wireless some static (Nest Doorbell) and several roaming between nodes (phones). Restarting dnsmasq via scMerlin, rebooting, reflashing, moving from B2 to B3, no difference. Eventually, on wired devices, they lose connectivity and I need to power cycle them to get the IP reassigned. Disabling Manual Assignment makes it go away. Also as part of the this, Network Map, Clients, View List - IP Addresses wire misidentified Static, Manual ,DHCP - haven't gone through the logs yet to correlate the MAC in the messages to the MAC associated with the misidenfied IPADDRs. Had to stop short as the wired AndroidTV boxes (one on each, Router, 2xAIMESH) were being impacted and no TV had family upset with me...
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:40 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:11:41 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:12:12 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:12:13 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 01:14:14 RT-AX88U kernel: 44:E4:EE:59
1:B5 not mesh client, can't update it's ip
Dec 31 12:51:29 RT-AX88U kernel: 44:E4:EE:59
5:42 not mesh client, can't update it's ip
Dec 31 12:51:29 RT-AX88U kernel: B0:65:BD:1B:F7:EF not mesh client, can't update it's ip
Dec 31 12:54:43 RT-AX88U kernel: 44:E4:EE:59
5:42 not mesh client, can't update it's ip
Dec 31 12:54:43 RT-AX88U kernel: B0:65:BD:1B:F7:EF not mesh client, can't update it's ip
Dec 31 12:56:03 RT-AX88U kernel: B0:65:BD:1B:F7:EF not mesh client, can't update it's ip
Dec 31 12:59:45 RT-AX88U kernel: B0:65:BD:1B:F7:EF not mesh client, can't update it's ip
Dec 31 13:00:19 RT-AX88U kernel: 44:E4:EE:59
5:42 not mesh client, can't update it's ip
Dec 31 13:00:19 RT-AX88U kernel: B0:65:BD:1B:F7:EF not mesh client, can't update it's ip
Didn't try this in 384.19 and didn't use 386.b1 so can't say whether or no it was happening there too.
Since turning off manual assignment, messages, issues have subsided. Will seen when the IP's renew if they get labled correctly in the client list.