That`s definitely not related, since the only changes between beta 2 and final were related to Tor and OpenVPN:
Code:
merlin@ubuntu-dev:~/amng$ git log 386.7-beta2..386.7 --oneline
94cc3d910e Bumped revision to 386.7 final
b7b2da99b0 Updated documentation
77bf6e916b shared: increase max ipv6_dns1_x length to 39 chars
6303f0be67 libovpn: also allow inbound OVPN client traffic destined at the router itself when the firewall is set to allow it
98b053d93c tor: updated to 0.4.7.8
That would probably imply they are logged at a lower priority than what your remote syslog shows, or they are filtered by the router (a few warning messages are filtered like that on the Syslog display page).
No.
Reboot with no USB disk plugged, then try with a different browser.
That addon is incorrectly showing you old work-in-progress pages that should not be visible. There is no Wireguard webui support at this time.
dnsmasq hasn't changed in many months, so something else on your router is causing it to crash. If you use an addon that modifies its config (like Diversion), try disabling it.
Double check that you have the correct model. Reboot the router with no USB disk attached, then try again with a different browser.