JabRef version 5.1 on macOS 10.14.6

I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists.

It seems the way accents are handled in author names, is not consistent.

• "Lef{\`e}vre, V." is found when entering "Lefevre" in the search field. The same holds for "Pr{\'e}vost, M." when entering "Prevost".

• However, "M{\"u}hlbach, G." is not found when entering "Muhlbach" in the search field. The same holds for "D{\'{\i}}az, J." when entering "Diaz", and "Nj{\aa}stad, O." when entering "Njastad" or "Njaastad".