recovering a snapshot might have caused the problem
Is the automatic backup snapshot still around by chance? (not the usual pre/post ones, the kind that have “_backup_” in their name and record the state before restoring)
Perhaps comparing network related configuration files can give a clue (assuming this is indeed the cause). The dnsmasq ones specifically. I hereby confess my head exploded last time I tried to make sense of all the interactions between networking components.
cat /etc/resolv* ?
Maybe deleting and recreating the wifi connection?
Also worth trying the wifi.powersave = 0 thing from this thread
Realtek RTL8822CE Wifi - limited connectivity - #5 by tbg