[NTG-context] Kerning in Noto Serif

Hi all, I can't get Kerning working with Noto Serif. My minimal file is:

\definefontfeature[oldstylenumber][onum=yes] \definefont[testnoto][file:NotoSerif-Regular*default at 12pt] \starttext Line 1: {VAVAVAVAVAVA 12345}\par Line 2: {\setff{oldstylenumber}VAVAVAVAVAVA 12345}\par Line 3: {\addff{oldstylenumber}VAVAVAVAVAVA 12345}\par \testnoto Line 4: {VAVAVAVAVAVA 12345}\par Line 5: {\setff{oldstylenumber}VAVAVAVAVAVA 12345}\par Line 6: {\addff{oldstylenumber}VAVAVAVAVAVA 12345}\par \stoptext

Line 4 and 6 should be significantly shorter too. I tried the variable and the static versions. In fontforge I can see a kerning of -80 between A and V. My context is the newest lmtx.

Greetings Lutz