This is quite minor, at least in the situation I saw it in.
The notifications menu looks like it shows raw topic titles, without applying the backslash escaping rules. Compare left and right red boxes:
Here’s what the raw thread title looks like:
And how the title is rendered when viewing the topic itself:
All look correct to me except for the notification menu.
(We also surely have proof that time travel will never exist, as nobody has gone back in time and stopped MS-DOS / Windows from using a common escape character all over file paths and leaking into conversations about file paths. )