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Liangent reported failure of section expansion on this page in beta and dragons mode:
https://zh.m.wikipedia.org/wiki/Wikipedia:2012%E5%B9%B4%E9%A6%96%E9%A0%81%E8%A8%AD%E8%A8%88%E5%BB%BA%E8%AD%B0/%E5%9F%B7%E8%A1%8C%E6%94%B9%E7%89%88

It looks like the same page works in main namespace but fails in Project namespace:
https://zh.m.wikipedia.org/wiki/Bug_test_page_1
https://zh.m.wikipedia.org/wiki/Wikipedia:Bug_test_page_1

No visible JS errors in log.

I noticed this last night. I've got a fix but I was investigating a way of redoing this code..

FYI it was enabled only on main namespace in JS but not in PHP.

Related URL: https://gerrit.wikimedia.org/r/64208 (Gerrit Change I97a42df9f5c9c2a05bcfcc64a3319301e4102377)

https://gerrit.wikimedia.org/r/64208

https://gerrit.wikimedia.org/r/64208 (Gerrit Change I97a42df9f5c9c2a05bcfcc64a3319301e4102377) | change APPROVED and MERGED [by Jdlrobson]