My Temp fix is:
In the file /etc/dnsmasq.conf prepend the following lines
#hack in googles dns servers
I am having the same issue.
What I have found so far : dnsmask is not getting its resolve.conf set when on wifi. dhcpcd is collecting the wlan0 address from the dhcp server but not setting reslov.conf in /run/dnsmask/resolv.conf
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