-
It's definitely a bug, reproducible and easily documented.
I believe it's us (Cloudflare) and that it's a global issue. An internal JIRA has been created and we are working on it.
I've found mentions of other customers experiencing it, and it appears to have started late last night (@hippy was the first to raise it in a PM with me, but I thought it was something else at that time as the redirects he followed originated from emails).
Try one "in reply to" to a different page... then find another, and try that too.