When using copyToClipboard to copy a string that contains non-ASCII characters, the copied text doesn't match the actual string.

For example:
copyToClipboard "привет! 元気" gives:
привет! 元気
when pasted using ctrl+V.

However, if copyFromClipboard is used to paste the code, it works correctly.

I'm not sure if this helps, but converting the string to array (toArray) works and can be used as a workaround to copy the text (although it is encoded in UTF-16, and needs to be decoded using an external program):

_chars = ["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
_fnc_getHex =
{
    _code = "\u";
    for "_i" from 3 to 0 step -1 do {
        _quo = floor(_this/16^_i);
        
        _code = _code + _chars#_quo;
        
        _this = _this - _quo*16^_i;
    };
    _code
};

copyToClipboard (toArray "привет" apply {_x call _fnc_getHex} joinString "")