#202 Incorrect hyphenation inside short directinality switch with system font

[Anonymous]

\font\foo="[lmroman10-regular]" at 10pt\foo
\TeXXeTstate=1\hsize=0pt

\hskip0pt Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz
\vskip10pt
\hskip0pt\beginL Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz\endL
\bye

If I remove the first line, the hyphenations is correct.

[Jonathan Kew]

Yes, this appears to be a bug; thanks for reporting.
I think a workaround would be to add \hskip0pt before the \endL command.

[Anonymous]

Thanks for confirming, and for the nice workaround. Note that there was a problem with TeX--XeT and hyphenation before https://tex.stackexchange.com/questions/141769/bidi-and-hyperref-change-hyphenation, but now I guess this is related to how XeTeX shapes chunks of text (using ICU and HarfBuzz) when a system font is used (but I know nothing about the source code).