On the page List of George Floyd protests in the United States, references after ~230 show links to the citation template instead of the reference content.
It seems like the (very long) page is going over the template transclusion limit, especially with the mapframe.
This issue might just be "a too-big page is too big", but worth reviewing.
Last version exposing the problem: https://en.wikipedia.org/w/index.php?title=List_of_George_Floyd_protests_in_the_United_States&oldid=961161328#References (see reference 221 and later), which shows in the source: Post‐expand include size: 2097139/2097152 bytes
Worked around in next edit via https://en.wikipedia.org/w/index.php?title=List_of_George_Floyd_protests_in_the_United_States&type=revision&diff=961163571&oldid=961161328 , which shows in the source: Post‐expand include size: 1672938/2097152 bytes
See T189108: Increase the « Post‐expand include size » process up to 2.5 MB or a good bunch of other tickets.
I don't understand why this is on Maps (Kartographer), does that requires Kartographer to behave differently?
I haven’t investigated this particular case, but I believe that the point is made in another ticket somewhere as well. The output of mapframe generates a lot of wiki content because it encodes a lot of information after template expansion. This is inefficient and can quickly inflate the overall size of the page, without editors noticing it.
There are some ideas that this can and/or should be made more efficient.
Maybe you're referencing this? T138790: All map data should be stored and transmitted as topojson