Unicode encoding conflict for folder with ASCII characters

[beatrixwillius]

My app Mail Archiver can export emails to PDFs complete with mailbox structure. A user saves his PDFs to Dropbox. He sent me a screenshot where a folder shows "(Unicode encoding conflict)". As developer I know enough about encodings. The encoding conflict doesn't make sense for 2 reasons:

- The mailbox name and therefore the folder name in Finder has ASCII characters only. I can't share the name from the user but it's similar to "something video edits 20240101".

- My app creates the folders always with the same encoding.

Any idea what might cause this problem?

[beatrixwillius]

I should have checked the mailbox name before posting. I was able to reproduce the problem myself with the user's data:

 I really wish that Dropbox had better unicode support.

[beatrixwillius]

Found the problem: the mailbox has a space at the end. Sigh... this is embarrassing in 2024.