[OS X TeX] expansion=default with fontspec in LuaTeX

[Thomas Bohn]

Hello,

I used to put this into my preamble to get microtype with fontspec working

\newfontfeature{Microtype}{protrusion=default;expansion=default;}

Recently this lead to an error while running luatex:

LuaTeX error (font expansion): font has been expanded with different
expansion step.

Removing this is breaking microtype.

TIA

Thomas