Here's a long paragraph with unclosed square brackets, followed by File markup with a wikilink in the caption. Run general fixes on this text...
[[he abandoned realism and steered his work towards a more mythical and aestheticizing, almost evasionist tone, as denoted in his decorative plafonds for the Cau Ferrat of 1896 La Pintura, La Poesía, La Música.
[[File:Somni_Joan_Brull.jpg|thumb|''Ensueño'' (1897) by [[Joan Brull]], National Museum of Art of Catalonia, Barcelona]]
...and the square brackets before the word "Joan" get turned round, breaking the caption and ending the File markup prematurely. This converts a small problem into a larger one. Oddly, I find that with fewer characters of plain text in the long paragraph, this does not happen.
Reported at https://en.wikipedia.org/w/index.php?title=Wikipedia_talk:AutoWikiBrowser&oldid=1127953226