I'd gotten a 50x error page when trying to submit this post, too - but it went through anyway? This post doesn't show up in my threads page, though.
I read back your earlier comments before I tried posting - I know you have other pressing matters on your plate. As you can see, I just created this user at artemis.camp, so that I can get those notifications ... maybe?
I can see the post when I go directly to it (with either the kbin.social or artemis.camp account), but it does not appear in my threads area under my kbin.social account (the one that posted it).
What's up with notifications? (kbin.social)
https://kbin.social/settings/notifications...