Test case:
===Article text===
Lorem ipsum<ref name="expl_A" group="n" />
Carpe diem<ref name="expl_B" group="n" />
===Explanatory notes section===
<references group="n">
{{#tag:ref
|Explanation B
|group="n"|name="expl_B"}}
{{#tag:ref
|A link to B<ref name="expl_B" group="n" />
|group="n"|name="expl_A"}}
</references>
===References section===
<references />Result: Failure. The <ref> inside the #tag:ref is "invisible". No message.