Since Feb 5th if you use NextDNS’s IPv6 servers as a VPN’s DNS server, websites won’t load on WiFi when on iOS 14.4 and 14.5 beta 2. I was originally using Disconnect Privacy Pro using NextDNS’s IPv6 DNS servers but since Feb 5th, I had to either turn off Disconnect Privacy Pro to get webpages to load or switch to data to get the webpages to load. 
 

I hope this issue gets fixed because it’s the only way I can use ExpressVPN and also block ads in apps at the same time.