The postion of input box is wrong when using Chinese input method

I’ve submitted an issue to Joplin earlier this year. Joplin is a note application using Code Mirror as editor. They said that issue must be fixed by Code Mirror. After about 3 months,nothing changed.
Is this possible put this into Code Mirror’s bug list?

This is unlikely to be fixed in the current 5.x versions (which they are probably using), but if they ever upgrade to 6.x, the problem should no longer exist there.

Thanks for your reply.