Why Text display not correct after set to Illustrator?

this code:

var odoc=app.activedocument;

var otxt=odoc.textframes[0];

otxt.contents="ô";

result:

but if copy , paste illustrator, display ok:

why text display not correct after set illustrator?

how auto convert same copy & paste?

the font used in textframes[0] not have glyph (ô), need change font 1 does.

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