I had the same question a couple months ago, not about a "bug" bug, but a flag I'd have raised on something I spotted on Software Engineering. I didn't have an account there, and did not want to create one just to raise a flag, so, as chat is cross-Stack Exchange (save for Stack Overflow and Meta), I posted the following in the stack's chat:
Hi guys. I don't have an account on this site and I don't want to create one just to raise a flag, so I'm dropping that here, in case it hasn't been spotted before: this site has modeling and modelling tags, both without wikis but likely to be about the same stuff. Maybe they should get synonymized/merged or one gets nuked or something. Just saying :)
A chatter with an account eventually brought it to the per-site meta, and it was actioned.
I raised a similar issue in The DMZ, Information Security's chatroom, after spotting a disorienting (but by-design) redirection for logged-out users:
Hi there :) I'm just here to point out that this question security.stackexchange.com/q/201992 is closed as a dupe of a merged question (hence it's a rare self-duplicate!). Not sure what can be done, though, but meta.stackexchange.com/q/232442/398063 reported and apparently fixed a similar situation. It's really nitpicking but as it's a tad bit desorienting for a logged-out user, I thought I'd point it out. Cheers :)
I think as long as you don't sound like you're dumping an issue for the stack's community to handle, can explain a bit why it is an issue or stuff, the community will receive it positively.