>>regner+r1
It's possible your ISP is intercepting all traffic for port 53 and sending it to their own nameservers (which do send client subset) instead of you actually taking to cloudflare's 1.1.1.1 at all.
>>abtinf+O8
ISPs in several countries I've been to do this to blacklist "objectionable" sites (which apparently includes reddit now) at the DNS level. Turning on DNS-over-HTTPS solves that.