From a Wikia staff member working on ZH communities:
Basically we need to type Pinyin (English words) first to select Chinese characters, but the New VisualEditors react very slowly or over fast. Before I make a Chinese word, the en words already pop up and are put in the editor.
Here's a video of the bug happening on Mediawiki.org: http://youtu.be/G1WStvYrPPA
Report comes from Mac/Chrome but it could be happening on more.
I asked if this was the same issue as T63429 but he said it was not.
Version: unspecified
Severity: normal
OS: Mac OS X 10.9
Platform: Macintosh