To reproduce the issue, use Ctrl+Enter to create 3 placeholders and enter 你 好 (or α β) in sequence and wrap it with a pair of " and execute. The output will be a pink box with the following message:
A
GridBoxcontaining rows of differing lengths was encountered.
$Version (* "13.3.1 for Microsoft Windows (64-bit) (July 24, 2023)" *) 




In[22], then go to the menuCell > Show Expressionand include this in your question. This might help us deducing what is wrong with your input. $\endgroup$GridBoxsomehow doesn't allow it. I don't know what to do, but I know some people here speak Chinese so they probably know how to deal with this :) $\endgroup$