Can't see this now. But here: https://en.wikipedia.org/w/index.php?oldid=471268078#What_action_should_users_take_will_be_shown_on_the_blackout_page.3F

Ah yes, thanks for finding that. I'm not in the habit of pasting links to old revisions, but for the purpose of reporting bugs, I need to remember to do that in case something gets changed. I have discovered one instance where recent revisions affect old revisions in Semantic Forms, which has me befuddled:

https://bugzilla.wikimedia.org/show_bug.cgi?id=33424#c19

pretty sure that is a different bug since SemForms isn't installed on enwiki, though.

I know, I was just giving an example of the last time I tried to link to old id's that didn't work due to a bizarre bug. It sort of worked against me in developing the habit of linking to a specific version of a page when reporting bugs.

It actually does… but not all formatting. Only some whitelisted tags. Try this this wikitext:

__TOC__
== <s>strike-through</s> ==
== <b>bold</b> ==
== <i>italic</i> ==

(preview)

Change 312093 had a related patch set uploaded (by Bartosz Dziewoński):
Parser: Allow <s> and <strike> in table of contents

https://gerrit.wikimedia.org/r/312093

Change 312093 merged by jenkins-bot:
Parser: Allow <s> and <strike> in table of contents

https://gerrit.wikimedia.org/r/312093