I'll try some more or less ancient versions of lily to find out:
1. if the problems also appears using former versions
2. if not, what's the first version the problem appears.
After playing around with versions I found out the following:
1. The change from "everything fine" to "stems misattached" seems to be
between v2.7.12 -> v2.7.17 (no version in between available for XP)
2. The change in behaviour occurs by chance when Staff.verticalExtent
becomes Staff.VerticalAxisGroup #'Y-extent.
3. In v2.7.17+ the error occurs only when setting the Y-extent.
Perhaps this will give a clue about the source of error.
Kind regards,
Thies Albrecht
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