This report is about an inexplicable diff in the Wikipedia article about LSD:
https://en.wikipedia.org/w/index.php?title=Lysergic_acid_diethylamide&diff=644418282&oldid=644415096
The user added a {{citation needed}} template, which appears to have been subst'd, or perhaps converted to HTML. I have not received a reply from the editor yet, and will post here if more information is forthcoming.
This is probably related to T86401 except that I can't see any reason in this edit for cutting and pasting.
The page https://en.wikipedia.org/w/index.php?title=Lysergic_acid_diethylamide&diff=644418282&oldid=644415096 has three instances of Citation needed
The first Citation needed, the one that actually produces spurious HTML is, in fact, displayed as an internal link in VE - Wikipedia:Citation needed:
The source code:
=== Alteration of gene expression ===
Chronic administration of LSD alters [[gene expression]] profiles in the [[medial prefrontal cortex]]. Evidence form studies in rodents demonstrates that chronic LSD affects the expression of [[DRD2]], [[GABRB1]], [[NR2A]], [[Krox20]], [[ATP5D]], [[NADH dehydrogenase (ubiquinone), alpha 1|NDUFA1]], [[Neuropeptide Y|NPY]], and [[BDNF]], among others.<sup style="white-space:nowrap;" class="noprint Inline-Template Template-Fact">[<i>[[Wikipedia:Citation needed|<span class="" title="This claim needs references to reliable sources.<nowiki/> (September 2014)">citation needed</span>]]</i>]</sup> Many processes identified as altered by chronic LSD are also implicated in the pathogenesis of schizophrenia.<ref>Martin DA (2014): Neuropharmacology. Epub. PMID 24704148</ref>
Other Citation needed on the page use the proper template, e.g. {{citation needed|date=September 2014}}.
Btw, if you perform VE Find search - only <sup style="white-space:nowrap;" class="noprint Inline-Template Template-Fact">[<i>[[Wikipedia:Citation needed|.... is found. Others won't be found by VE Find features because they are templates(the browser search finds them).
Unfortunately, Emborion's description "I simply wrote: citation needed -surrounded by: {{ }} -without a date." - did not help me to reproduce the bug. Simply typing {{ in VE triggers Template insertion.