This could simply be a catalog item on WIkidata.

• https://tools.wmflabs.org/scholia/topic/Q12156 (malaria - co-author graph does not display)

• https://tools.wmflabs.org/scholia/topic/Q172341 (ovarian cancer)

• https://tools.wmflabs.org/scholia/topic/Q38404 (autism)

https://tools.wmflabs.org/scholia/topics/Q12174,Q101991,Q111140,Q61231 (authors do not display)

https://tools.wmflabs.org/scholia/topic/Q1492760 (teenagers)

In https://tools.wmflabs.org/scholia/author/Q17714 (Stephen Hawking), the timeline does not fit vertically.

https://tools.wmflabs.org/scholia/chemical-class/Q282 (wine) — the class hierarchy wobbles

In multi-author comparisons like
https://tools.wmflabs.org/scholia/authors/Q80,Q6135847,Q18618629,Q30085536,Q52353442 ,
the Co-author graph gives

<h1>Bad Message 431</h1><pre>reason: Request Header Fields Too Large</pre>

for usually > 4 authors.

Rare diseases: https://tools.wmflabs.org/scholia/topic/Q929833

Property: https://tools.wmflabs.org/scholia/P921

Black hole: https://tools.wmflabs.org/scholia/topic/Q589

Here is a list of organizations by number of affiliated people known to Wikidata:

SELECT ?count ?institution ?institutionLabel 
WITH {
  SELECT (COUNT(DISTINCT ?researcher) AS ?count) ?institution WHERE {
    ?researcher ( wdt:P108 | wdt:P463 | wdt:P1416 ) / wdt:P361* ?institution .
    ?institution wdt:P2427 ?grid .
  } 
  GROUP BY ?institution
} AS %result
WHERE {
  INCLUDE %result
  SERVICE wikibase:label { bd:serviceParam wikibase:language "en,da,de,ep,fr,jp,nl,no,ru,sv,zh" . } 
} 
ORDER BY DESC(?count)
LIMIT 200 

I tested a bunch of them and noticed that most of them throw some error for the co-author network and the coauthor-normalized citations.