Happening on Affinity Designer 2.4.0 —but this seemed to be happening forever, I just never took the time to report it.
When printing a document and checking the "Include page information" with a filename including an accentuated character, such as "Étiquette", the printed mark will read "E´tiquette".
Not a major issue by any mean, but rather an annoyance for us non-native English speakers relying on file name for versioning purposes, as this reduces legibility of the marks. Seems like the font chosen for the marks supports accents without any issue so I guess this would not be that hard to fix —bear with me if it actually is, I'm a software engineer myself I know "seemingly simple" fixes aren't always.
Cheers,
Jordan