This issue occurs when I attempt to post the Chinese characters for the novel "Water Margin"
《水浒传》 as a quote on Mythology SE. The error occurs even if a single character
水 is posted. The question referred to is here.
However, this bug does not seem to occur on Meta SE, so it doesn't appear to be a SE-wide bug, but one that is confined to Mythology SE (and possibly other sites).
An image is attached of the error: