Something is preventing DNS lookup on your LAN, recheck pfsense, pi hole etc, also you might want to remove the PIA name servers, they are very unreliable recently, so change NAME_SERVERS to have a value of:-
84.200.69.80,37.235.1.174,1.1.1.1,37.235.1.177,84.200.70.40,1.0.0.1
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