Use Line Breaks duplicates new lines every time file is opened

I’m using Use Line Breaks custom parameter, but one of the updates between 1308 and 1312 seems to started duplicating new lines in feature code every time a file is opened (single new line becomes two, then 4 and so one).

I can’t reproduce this. Can you send me a file that does this?

Qahiri.glyphs (168.5 KB)

Original:

After opening and saving three times:

I missed the part with the multiple newlines. I’ll fix that.