InDesign V15 seems to have poor support for Unicode PUA plane 15 and 16. In the vertical arrangement of Chinese or Japanese, the characters in the plane are rotated 90 degrees when inserted into the text. Therefore, in InDesign, the Chinese and Japanese characters made on this plane (PUA 15, 16) cannot be well aligned with the vertical text. Microsoft word does not have this problem. The vertical arrangement of PUA characters can be well supported. I look forward to solving this problem in update.
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