Before I open the book:

Then:

After I close the book, everything remains in "Unicode-Off" state:

In some Unicode language like Chinese, Japanese, the guide book will turns ASCII characters into "Unicode-Off" but leave other characters unaffected, which makes the game GUI looks quite messy.

This should have been reported on the Enchiridion github. Not sure it will be fixed though, since I am working on Enchiridion 2 anyways.