JabRef version

5.15 (latest release)

Operating system

macOS

Details on version and operating system

Arch, Gnome 47

Checked with the latest development build (copy version output from About dialog)

• 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. Select Cleanup entries
2. Check Convert to biblatex (e.g. store publication date in date field)
3. Observe that date is still empty, while year contains something like 2011-11-11 or 2011

PS. BTW, shouldn't it be Clean up entries?

Appendix

No response