Can't input Chinese characters

[azone]

Expected behavior

Input Chinese characters in heading as usual

Actual behavior

Can't input Chinese characters in heading after first confirm if there is empty line before heading.
See the video below:

ScreenRecording_11-07-2017 17:26.MP4.zip

Steps to reproduce the behavior

1. Open editor
2. Press return
3. Turn Heading on (h1 or h2, ...)
4. Input any Chinese characters and confirm
5. Continue input Chinese characters and confirm (can't input anything in this step)

All those invisible Chinese characters will appears if rotate the device.

Tested on iPhone 7, iOS 11, Aztec beta-14

[jleandroperez]

Note:

In order to reproduce this one, please, set up the Chinese Simplified Pinyin keyboard.

Thank you!!