A problem occurs when inputting CJK (double-byte characters) with multiple cursors.
You can see it immediately by looking at the image.
The image was entered in the demo displayed on the top page of the site.
The image is operated with chrome96 (Mac).
With safari (Mac), even “knnth” is not entered, and all subcursors are blank.
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36