This bug also occurs in Obsidian Mobile version 1.0.4.
The details of the procedure to cause the bug are described below.
Set iPad OS 15.2 to Japanese, and turn on “Live Conversion” in “Settings” > “General” > “Keyboard” > “Hardware Keyboard” to enable live conversion.
“Live Conversion" is a function that automatically converts your input kana into Japanese mixed with kanji characters without having to use the spacebar.
After making the above settings, a problem arises when you try to input a long Japanese sentence.
On the iPad OS, when you are typing a long sentence, the beginning of the sentence is automatically converted to kanji at a certain timing, but on Obsidian Mobile, this problem occurs at that timing.
This is inconvenient for typing Japanese, so please improve the bug.