User:SPage (WMF)/imagemap bug

I imported a page with an imagemap (| Architectural Modules of MediaWiki) from a wiki running 1.24.1, and on mw.org running early 1.26 I got a red Error: Image is invalid or non-existent. .

This fails: The image line is
 * Image:RequestModules.svg|thumb|center|600px|Caption More details

and that is valid, if I surround it with  it looks fine:
 * [[Image:RequestModules.svg|thumb|center|600px|Caption More details ]]

The  in the caption seems to be the problem, without it the imagemap works

Again, this worked in 1.24.1