bibtex code not in sync with entry editor fields

[ilippert]

JabRef version

Other (please describe below)

Operating system

GNU / Linux

Details on version and operating system

JabRef 5.8--2022-10-03--e48ed0c

Checked with the latest development build

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

Steps to reproduce the behaviour

1. ... change an entry in the biblatex source field
2. ... observe that not all fields are changed in the entry editor's fields

JabRef 5.8--2022-10-03--e48ed0c Linux 5.19.12-200.fc36.x86_64 amd64 Java 18.0.2.1 JavaFX 19+11

And after saving and closing JabRef and reopening JabRef, the entry editor's data is present, the source information not anymore.

Appendix

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[Screencast from 07-10-22 11:49:32.webm](https://user-images.githubusercontent.com/20518297/194526601-f542c404-8b1d-415a-8632-4c7e1595a051.webm)

[Siedlerchr]

Guess it's the same underlying problem as in #9172