mmm I was asking me the same question, I’m not entirely sure.
I don’t migrate from a Glyph version to another in one jump at least not for the major review. So sometimes I’m in the middle: I open a file I’m working on with an old version and sometimes with the new one. I don’t remember exactly but at some point I compiled the custom alignment zone in the old version and then when I opened the same file with the new version and I saw this field compiled in this way I thought stupidly it was the new way to deal with this section… I exclude I did it manually.
Sorry I cannot help you more than this