In Affinity Publisher/Designer/Photo 2.3.1, copied text in rich text (RTF) is broken when system language is Japanese. I have found this issue while trying out the Font Switch feature of Typeface App.
To demonstrate:
Switch your system language to Japanese
Restart your computer
Open Affinity and create a new document
Create some text
Copy the text
Open Finder and choose Edit > Show Clipboard
(or open TextEdit and paste)
Tested on:
MacBook Pro 15 Mid 2018 (Intel)
macOS 11.7.10 Big Sur
I’ve heard that the same problem occurs in Monterey (Intel) and Sonoma (M2).
RTF commands start with backslash ( \ ) but it seems to be replaced with ( ´¥ ) due to extra escaping. (Note that some Japanese environment displays backslash as yen sign)