This is reproducible only in HTC Android devices (tested with HTC T528w). In Pinyin input method, when the first character in the TextInput is deleted, the next character in printed in Latin.

This has probably similar root cause with QTBUG-42300.

To re-produce:
1) in a TextInput/TextEdit, switch to pin-yin input method (HTC Sense Input)
2) press A, and choose "啊" from the suggestion list
3) press backspace once, so that the suggestion list disappear
4) press backspace once again, so the "啊" character is deleted
5) press A, it goes directly into the textbox as a capital "A" (the correct
behaviour should be showing a suggestion list of chinese characters again).