20:33:15 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:51162->[2a00:1450:4010:c02::54]:443, len 40
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 44
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (SYN,ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 32
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 309
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 1380
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 1380
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 122
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 100
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 135
20:33:36 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 135
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:36 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 512
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 44
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 104
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2a00:1450:4010:c0b::bc]:5228->[2a02:ad8:1484:7a00:85e8:a490:938f:49f]:60416, len 32
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2a00:1450:4010:c0b::bc]:5228->[2a02:ad8:1484:7a00:85e8:a490:938f:49f]:60416, len 59
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac ac:9e:17:27:ec:c3, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:85e8:a490:938f:49f]:60416->[2a00:1450:4010:c0b::bc]:5228, len 69
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 512
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 512
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 44
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,PSH), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 111
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:37 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 512
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:54302->[2a00:1450:4010:c01::8b]:443, len 40
20:33:37 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:38 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:54302->[2a00:1450:4010:c01::8b]:443, len 40
20:33:40 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:54302->[2a00:1450:4010:c01::8b]:443, len 40
20:33:44 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:54302->[2a00:1450:4010:c01::8b]:443, len 40
20:33:47 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,PSH), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 44
20:33:47 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK,FIN), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:47 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:47 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (ACK,FIN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072->[2606:4700:4700::1001]:853, len 20
20:33:47 firewall,info forward: in:pppoe-out1 out:bridge1, proto TCP (ACK), [2606:4700:4700::1001]:853->[2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:41072, len 20
20:33:48 firewall,info forward: in:bridge1 out:pppoe-out1, src-mac b4:6b:fc:dd:1c:3d, proto TCP (SYN), [2a02:ad8:1484:7a00:3b30:ac91:7187:e50f]:51162->[2a00:1450:4010:c02::54]:443, len 40
I've just checked and I am even able to manually resolve hosts with nslookup through IPv6 Cloudflare DNS (until those logs I thought it was DoH that resolves everything)
Maybe its ISP indeed...