There's not really much to say about it aside from the title. The 2k+ inline editor used to work, now it doesn't. The edit link now goes to the full edit page instead, and it did happen somewhat late (in +2 GMT anyway) today.
Aside from me, it has been reproduced by at least some other users in SOCVR.
The 10k+ tag editor still works though, so it only affects the inline post editor.