I can confirm this works as expected on group2/wmf.31 but is broken on wmf.32. Also it still works in all versions under MonoBook, which suggests it is a bug in Vector that was introduced in the new branch.
Issue on https://www.mediawiki.org/
Vector (wmf.32) | MonoBook (wmf.31) | Vector (wmf.31) |
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Issue on https://wikitech.wikimedia.org/
(wmf.32) |
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