This problem pertains to https://zh-yue.wikipedia.org/wiki/加冷河. The sidebar interwiki linking tool is not working. It would stop at the confirmation pop-up and could not display the links to other wikis, ultimately failing to link.
Two tests have been carried out.
After encountering this bug, I tried another article https://zh-yue.wikipedia.org/wiki/劉太格. The tool worked as usual.
We also tried removing wikidata-dependent templates from 加冷河, which we suspected to be the cause. The tool still failed.
The corresponding wikidata item is https://www.wikidata.org/wiki/Q1094417 . To link the page you may use the following among others.
enwiki - Kallang River
dewiki - ditto
mswiki - Sungai Kallang
zhwiki - 加冷河