Korean text doesn't combine on a new line in descriptions (iPhone)

When typing Korean (Hangul) in an entry's description on iPhone, two things go wrong:

• On a new line, the first syllable does not combine. Typing 냉장고 gives ㄴㅐㅇ장고.
• In a new checklist item, the checkbox disappears as soon as the vowel of the first character is typed.

Titles are fine. The same text works correctly on Android and on the web.

Workaround for now: delete and retype the first character, or type the text first and add line breaks and checkboxes afterwards.