Pixel 6 can't access certain websites on wifi, but the Pixel 3 works fine

My Pixel 6 can't connect to a few domains like api.reddit.com, api.bitwarden.com, WSJ images, etc. I'm using [PingTool](https://play.google.com/store/apps/details?id=ua.com.streamsoft.pingtools&hl=en_US&gl=US) to run ping and tracert to certain domains. |Phone|Domain|Network|DNS|Result| |--|--|--|--|--| |Pixel 3|api.reddit.com: DNS -> IPv4|home wifi|203.0.113.2, 203.0.113.3|✅| |Pixel 3|api.reddit.com: 151.101.57.140, IPv4 direct|home wifi|203.0.113.2, 203.0.113.3|✅| |Pixel 3|api.reddit.com: 2a04:4e42::200::396, IPv6 direct|home wifi|203.0.113.2, 203.0.113.3|❌| |Pixel 6|api.reddit.com: DNS -> IPv6|T-mobile|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: 151.101.57.140, IPv4 direct|T-mobile|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: 2a04:4e42::200::396, IPv6 direct|T-mobile|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: DNS -> IPv4, before IPv6 kicks in 30 seconds later|home wifi|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: DNS -> IPv6|home wifi|203.0.113.1, 203.0.113.2|❌| |Pixel 6|api.reddit.com: 151.101.57.140, IPv4 direct|home wifi|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: 2a04:4e42::200::396, IPv6 direct|home wifi|203.0.113.1, 203.0.113.2|✅| |Pixel 6|api.reddit.com: DNS -> IPv4|gym wifi|?|✅| |Pixel 6|api.reddit.com: 151.101.57.140, IPv4 direct|gym wifi|?|✅| There's something going on with IPv6 DNS and it affects a number of sites: Reddit, WSJ, Fitbit, etc. How do I disable IPv6 for wifi? Most of the instructions I've found only apply to mobile networks.