[Dev-luatex] fontfeature problem in luatex since rev 6378

Hi all, the most recent luatex seems to have problem with extending fonts. (linux-armhf rev 6378 and 6379, Windows 64 rev 6378) My example: \definefontfeature[extend][default][extend=1.4] \definefontfeature[narrow][default][extend=0.8] \definefont[one][name:yanonekaffeesatzbold*narrow] \definefont[two][name:yanonekaffeesatzbold] \definefont[three][name:yanonekaffeesatzbold*extend] \starttext \one Montag, 3. Juli 2017\par \two Montag, 3. Juli 2017\par \three Montag, 3. Juli 2017 \stoptext Is it a bug or am I missing something? Greetings Lutz