-\protected\def\zw{\directlua{luatexja.jfont.load_zw()}\ltj@zw}
-\protected\def\zh{\directlua{luatexja.jfont.load_zh()}\ltj@zh}
+\protected\def\zw{\directlua{tex.setdimen('ltj@zw', luatexja.jfont.get_zw())}\ltj@zw}
+\protected\def\zh{\directlua{tex.setdimen('ltj@zh', luatexja.jfont.get_zh())}\ltj@zh}