LAN clients not getting DHCP ips

[shdf]

could it be related to this ?

OpenWrt 22.03.5 fifth service release

The same problem happens to me about "obtaining IP address" and the culprit is dnsmasq, but I solved it by replacing dnsmasq with odhcpd + Unbound on the main router (no dumb AP) following the steps in this guide:

Maybe try with the previous version of OpenWrt ? or the snapshot as suggested in the link.