I've had Gemini CLI (the coding agent!) smuggling in Chinese words in the output - completely unexpectedly, I do not speak and never discussed anything Chinese

I've had Gemini CLI (the coding agent!) smuggling in Chinese words in the output - completely unexpectedly, I do not speak and never discussed anything Chinese with it. Copilot was mixing in Cyrillic character, unprovoked - take "обligation", for example. And so did Grok, when discussing Russian anecdotes - "KRЯК". Very helpful reminder to not anthropomorphise them machines.