JabRef version

Latest development branch build (please note build date below)

Operating system

Windows

Details on version and operating system

Windows 10 21H1, JabRef 5.4 (2021-09-10)

Checked with the latest development build

• I made a backup of my libraries before testing the latest development version.
• I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Create a new library and citation
2. Fill in author field, e.g., Nu{\~{n}}ez, Jose and Smith, John
   The error does not occur with any other accent characters (\"{o}, \'{e},\u{o}, etc.)
3. The warning sign appears by the field and integrity check displays the message "Names are not in the standard BibTex format"

Appendix