The name shown on the title does not render correctly in version 4.0. It is displayed only as “nczuk” (with an acute accent over the ‘n’)
Further, it is sorted as the first item in the list, which is illogical - this is an ‘L with a stroke’ - and inconsistent with the (sensible) behaviour that sorts “\u{S}progar” as a ‘S’ with diacritic.
and changing my bib file to read “{\L}awry'{n}czuk” does indeed display correctly with a number of fonts. What has thrown me here is that JabRef 3.8.2 appears to display “\Lawry'{n}czuk” correctly although on closer inspection, the ‘L’ does not have a stroke through it. FWIW: Citing as “\Lawry'{n}czuk” gives an unrecognised control error in Latex; the set of curly braces around “\L” are needed.
The upshot is that my bib file entry was incorrect but I was fooled into thinking it was OK because JabRef 3.8.2 seemed to display it correctly. The corollary is that the parser in version 4.0 now does a better job of aligning with Latex . So, well done for the bug fix! Issue closed.
thank you very much for the feedback! You can always enter names in Unicode and let them convert to latex via right click in the authors field -> Convert to latex… This also works vice versa
With version 4 we switched to a new latex2unicode parser which is more powerful and flexible