I have several on my suggestion list that have defied my ability to transition them to fixed, e.g.
https://www.wikitree.com/wiki/Ball-4357
which contains:
...<ref name=MassBC>[[#MassBC|Massachusetts Births and Christenings, 1639-1915, database, FamilySearch]]</ref>...
== Sources ==
<references />
...<span id='MassBC'></span>"Massachusetts Births and Christenings, 1639-1915",...
I'm about to try changing the id on some other profiles to see what that does, or removing the span tag to see if it changes to a "missing span tag" suggestion, but it does not seem like I should be guessing.