Jon Katz, 22/11/2017 03:29:
The issue you raise, is a known issue being tracked
and worked on here
The issue I raise is that you should not make a change that makes life
worse for all users. The feature is currently useless in 100 % of cases,
so you should have rolled back immediately to the previous system as
long as it works even in 0,1 % of the cases.
For now, I'm telling people to use the PediaPress book builder and
ignore the PDFs produced by Wikimedia Foundation. This is not sustainable.