When opening a link from the image caption editor with ctrl+click the link target is assumed to be in the same namespace as the currently edited page.

For example a link to [[Bridgnorth Cliff Railway]] from the caption of an image on the page [[User:Thryduulf/sandbox]] is opened as [[User:Thryduulf/Bridgnorth Cliff Railway]]. A link to [[User:Thryduulf/sandbox2]] on the same page opens [[User:Thryduulf/User%3AThryduulf%2Fsandbox2]]. A link to that sandbox page from a page in the article namespace opens as [[User%3AThryduulf%2Fsandbox2]], but this does get you to the correct page.

This only happens before the page has been saved. Once a page is saved and re-opened links that were in the caption when it was saved open the correct page, but newly added or changed links do not.

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52093
https://bugzilla.wikimedia.org/show_bug.cgi?id=51122