monthfiled formatted incorrectly in the BibTeX source

[7Z0t99]

JabRef version

Latest development branch build (please note build date below)

Operating system

Windows

Details on version and operating system

JabRef 6.0-alpha2.320--2025-06-17--ec413c0 Windows 10 10.0 amd64 Java 24.0.1 JavaFX 25-ea+20

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

Create a new patent entry in BibTeX mode and choose a month (e.g. #may#) in Optional fields tab → Monthfiled drop down menu. Go to the BibTeX source tab. It shows:

@Patent{,
  monthfiled = {#may#},
}

Notice the extra {# #} around the month string. The correct format would be without them:

@Patent{,
  monthfiled = may,
}

Note that this is a regression: JabRef 5.4 does format it correctly, while JabRef 5.5, 5.15 and 6.0-alpha2.320--2025-06-17 don't.

Appendix

No response

[Siedlerchr]

Hi, this is related to BibTeX-String resolution
https://docs.jabref.org/advanced/strings#rendering-of-constants-in-jabrefs-entry-editor
You need to add the field monthfiled to the list of fields here.
Seems like we should add this as default field to the list as well.

[7Z0t99]

Thanks for the explanation, I will add monthfiled in my preferences.

I agree, it would be great if you could add monthfiled to the default list, because you have implemented the logic for monthfiled before (see #3896). And to be honest, as a user it's strange to have one without the other.

[Siedlerchr]

@7Z0t99 Thanks for finding the PR, it was probably just forgotten when we switched the logic.

[github-actions]

We think that this issue was fixed. Please head to https://builds.jabref.org/main to download a development build and try it out.

For any feedback, add a comment to the pull request at #13379.