Assuming that the contents of "Another Page" were "A String", should the below markup produce a link to "Some Page" with the link's text being "Random Message A String"? I have used code similar to this and initially it functioned as described, but later a link was not produced and instead the text produced was "[[Some Page|Random Message {{:Another Page}}]" (i.e. the original markup missing the final square bracket). Bug or simply unspecified behaviour?
[[Some Page|Random Message {{:Another Page}}]]