JabRef version

5.5 (latest release)

Operating system

Windows

Details on version and operating system

JabRef 5.5--2022-01-17--27a05c7 Windows 10 10.0 amd64 Java 16.0.2 JavaFX 17.0.1+1

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. Set the default pattern of the Citation key pattern to [auth][year]
2. Add an article with a first author who's surname starts with a lower case letter (e.g. https://arxiv.org/abs/2103.10697) or edit an existing article so that the first letter of the first author's surname is lower case.
3. Hit 'Generate citation key' -> 'Overwrite keys'

The resulting Citation key is missing the [auth] field and is just displaying the year.

Appendix

No response