When using Chinese characters as TeX commands, font artefacts appear. Parts of the command after the glitch are not recognized by the parser - this is true also for German umlauts.
Apparently a similar problem was found with Perl some time ago:
The examples from the Perl issue:
\中文 (hex 0x4E2D 0x6587）(zhong wen)
\應龍 (hex 0x61C9 0x9F8D) (ying long)
also yield phantom chars with Tex.