This cause a lot of trouble in actual use.
Gem Menu for Mac OneNote now offers a feature to clean these extra spaces.
At first, choose and select a picture in OneNote for Mac.
Then, click "Gem Menu for Mac OneNote" -> "Edit" menu -> "Image OCR Text" menu item.
Gem will pop up an Image OCR Text window.
In this window, you will found there is an extra space between 2 Asian words.
In bellow of "Image OCR Text" window, click "Clean Extra Spaces" button to clean these extra spaces between Asian words.
Note: "Clean Extra Spaces" is not clean all spaces. From bellow image, you can found it just remove the spaces between Asian words, and retains the spaces between English words.