Whenever I put the URL below into a post, Discourse throws a dialog telling me I’ve been logged out, and forces me to click a Refresh button. If I’m quick, I can click Cancel fast enough such that another dialog comes up, letting me Abandon the post. I was also able to click the Reply button quickly enough once, such that the post actually posted. But editing it now shows the same error.
Putting the URL in code text, as I’ve done here, prevents the problem from happening, but my first attempt to neuter it by removing the H from https made no difference.
This is in 2.6.0b1 and happens here on meta as well as on my site.