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.
Version: unspecified
Severity: normal
URL: 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