Sun Sep 23 2018 18:00:32 UTC
If there's anything to blame, it's the lack of unit tests.
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ID Product Comp Assignee Status Resolution Summary Changed
46142 Xamarin. Base Cla bugzilla CONF --- System.Configuration breaks mysteriously if you add "--embed-mono=false" to mmp args 2016-11-10
One bug found.

as

File a new bug in the "Base Class Libraries" component of the "Xamarin.Mac" product