[HarfBuzz] possible bug?

[Alfabety]

Hi,

I'm plying with hb-view as a server font renderer, because I need access to OT features.
Everything works OK except first feature tag in features parameter.

--features='numr=1,frac=1,ordn=1,smcp=1,cswh=1,pnum=1'
renders frac very nice, but:
--features='frac=1,ordn=1,smcp=1,cswh=1,pnum=1'
doesn't renders frac anymore.

Same is with 'smcp', 'pnum' etc... if tag is sent as a first in line.

Ł