> Which format are you using ? plain ? Yes, plain. You should append a \bye to both examples, I guess.Of course, the problem disappears when using luaotfload, which must be why no one has run into this bug before.Also there is no problem with mtxrun --script plain
Yes, the luatex-plain format used by mtxrun loads extra code that sets \attribute0=0 somehow. I could not find where. No attributes are set by luatex.fmt, however.
