Cannot connect to internet with Linksys MR8300 on 23.05.2

I have the same problem with Linksys MR8300. Fresh from the box, installed 22.03.06, as explained in the device page - everything was working fine.
Then increased the kernel size to 5MB and flashed 23.05.02 - I still had access to the router, but no internet. I didn't use PPPoE, I have a fibre modem and WAN should work straight away. I tried disabling the DHCP hostname on the WAN port, and restoring all settings to default. No success.
Then flashed 22.03.06, and I had internet access right away, without changing anything.

I don't know much about Linux or networking, but my guess is that 23.05 has some issue getting the IP address from the modem. Here is the Interfaces page on 23.05, the WAN interface does not have an IP.

Here is the log after restarting the WAN:

Fri Mar 22 22:33:37 2024 daemon.notice netifd: wan (2671): udhcpc: received SIGTERM
Fri Mar 22 22:33:37 2024 daemon.notice netifd: wan (2671): udhcpc: entering released state
Fri Mar 22 22:33:37 2024 daemon.notice netifd: wan (2671): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "wan" } (Permission denied)
Fri Mar 22 22:33:37 2024 daemon.notice netifd: Interface 'wan' is now down
Fri Mar 22 22:33:37 2024 daemon.notice netifd: Interface 'wan' is setting up now
Fri Mar 22 22:33:37 2024 daemon.notice netifd: wan (2984): udhcpc: started, v1.36.1
Fri Mar 22 22:33:37 2024 daemon.notice netifd: wan (2984): udhcpc: broadcasting discover
Fri Mar 22 22:33:38 2024 daemon.warn odhcpd[1284]: No default route present, overriding ra_lifetime!
Fri Mar 22 22:33:41 2024 daemon.notice netifd: wan (2984): udhcpc: broadcasting discover
Fri Mar 22 22:33:44 2024 daemon.notice netifd: wan (2984): udhcpc: broadcasting discover

Let's take a look at your configuration:

Please connect to your OpenWrt device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:
grafik
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall

Thank you. I flashed 23.05.3 again to gather the output of the commands you have asked, but this time it works fine. I don't know what happened. Sorry for the false alarm.
I would blame a leftover from previous configuration if I didn't pay attention to unchecking 'keep configuration' checkbox during upgrade, or didn't try to reset the settings. This is quite strange really. This time I checked the box to keep configuration from the previous firmware, but reset to defaults afterwards, because ethernet ports wouldn't link. I just tried to flash 22.03.6 and 23.05.3 again with the checkbox unchecked, just to make sure, and it still works fine.
I would try flashing stock firmware again and then OpenWRT, just to see if it would cause the same problem again, but it's too much trouble.

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